A swordsman steps in. Instead of meeting steel with steel, the defender's lead hand sweeps a flat circle in front of his own body — and the cut slides off the curve and goes nowhere, like rain running off a tilted roof. No counterblow lands. No one is broken. The attacker simply finds that the place he aimed at is no longer where the defender is, and the force he spent has been quietly turned aside. Dukes says this single circular wipe is the seed of the entire fighting art: every motion in Chuan Fa grows out of it.1 And the name for the whole skill of tactical encounter that it belongs to — Senjutsu — has been redefined. In an ordinary fighting school it means strategy and counterattack. Inside Buddhism it means something nearly opposite: skill in acts of non-harmful defense toward your opponent.2
In the esoteric mandala, the quarter ruled by the Buddha Amoghasiddhi (Chinese Pu Kung Cheng Tzu, Japanese Fukujoju) is where the Vajramukti fighting figures live, hands held in the "vajra closed hands on guard" position.3 Fukujoju embodies a specific flavor of enlightened mind: Krytyanusthanajnana — the wisdom of all-encompassing, discriminating mental and physical activity. The action-wisdom. It is the knowing that lets you make decisions and judgments in the middle of doing something, and it simultaneously reveals and frees the knowledge of the bodily training needed to generate and demonstrate it (Paravikriditasiksa).4
From this one aspect of wisdom, Dukes says, the whole art of tactical encounter — Chinese Hsien Hsiu, Japanese Senjutsu — emanates.5 That is the load-bearing claim. The tactics are not bolted on from the outside; they pour out of a particular Buddha's particular wisdom of skilled activity. And because the wisdom is non-harmful by nature, the tactics it produces are too. Senjutsu here is not the strategy of winning a fight. It is the strategy of ending a fight without adding harm to it.
The base motion is named. The Semmui In — the Fearlessness mudra, the upright right hand, palm forward — is the starting position for the circular defensive movement Dukes calls Parivrttapala (Chinese Hui Hu), "upon which all Chuan Fa motion is based."6 When that mudra is drawn in a circle before the body, "all and every attack against one's body was harmlessly redirected away from it."7 Defense first, harm never. The fighting art is a gesture of fearlessness set into rotation.
Walk the logic. A straight attack carries force along a line. If you put a hard stop in its path — a block that meets force with force — you absorb the line's full energy and you have to be stronger than it. But a circle has no line for force to land on. Sweep a curve across the incoming path and the attack meets a moving tangent: it touches, slides, and continues past, spending itself on empty air just to the side of where you were. You did not stop the force. You let it keep its momentum and changed only its direction. This is why the Semmui In is the base of everything — it is the cheapest possible defense, costing the defender almost nothing while costing the attacker his whole commitment.
The "fearlessness" naming is not decoration either. The Semmui In "represents a mental condition in which that which experiences fear no longer exists."8 A frightened body flinches, tenses, meets force with a clench. A fearless body stays loose enough to rotate. The mudra encodes the internal state that makes the external circle possible: you cannot wipe an attack off a curve if your arm has locked up to stop it dead. So the gesture is doing two jobs at once — it teaches the hand the motion and it teaches the mind the calm the motion requires.
Then there is the "time moments" piece. Dukes argues Chuan Fa's tactics developed out of a "realistic sense of 'time moments'," and that this points to the Sarvastivada school as the most likely transmitter of Chuan Fa's metaphysical doctrines into China.9 Sarvastivada analyzed experience into discrete momentary events. A tactician who can perceive an attack as a sequence of distinct moments — not one blurred rush — can find the exact instant to insert the circle. The doctrine of time-atoms becomes a doctrine of timing. The metaphysics is the footwork.
This page supplies the non-harm clause that the rest of the Chuan Fa machinery assumes but rarely states. Vajramukti: Buddhist Martial Philosophy gives the integrating frame — mind, speech, and body unified through the clasped hand — and this page tells you what that art is for: turning attacks aside, not returning them. Nata: Kinetic Practice supplies the moving-meditation substrate; the Parivrttapala circle is what that substrate looks like when an actual attacker is present. Mudra: Hand-Gesture Consciousness Encoding explains how a hand-shape carries a mental state; this page is the case where the encoded state (fearlessness) is also the operational state needed to execute the defense — the cleanest example in the corpus of mudra-as-software. And the Amoghasiddhi action-wisdom links to Prasada: Consciousness-Based Energy, since the same Sarvastivada lineage Dukes credits with the time-moments tactics also gave Chuan Fa its sensitivity-energy.
Right next to the Senjutsu definition, Dukes plants a small modern scene about reading intentions.10 A secretary answers the phone; the caller wants her boss. She looks up; the boss frowns; she understands the frown and tells the caller he is unavailable. Dukes uses this to define Vijnaptikayakrita — non-verbal bodily communication by sign or gesture — and says familiarity with its many patterns was an important warrior skill, because it let him "read" an opponent's intentions before any action.11
Read closely, this is where the non-harm doctrine gets its teeth. If Senjutsu were really counterattack, reading intention early would just mean striking first. But Dukes frames the reading as the front end of defense: you see the attack forming in the opponent's face and posture, and you are already turning your circle before the attack commits. The earlier you read it, the gentler the redirection can be — a small wipe at the source instead of a desperate one at the end. The frowning-boss anecdote, sitting where it does, quietly proves the system: tactical skill is perception first, and perception used to avoid harm rather than to land it. The fighter who reads best fights least.
Dawn, packed-earth floor, your partner across from you with a wooden sword. He lifts it. You feel the old reflex want to fire — meet it, stop it, push back. You let that reflex go unfed. Right hand comes up, palm out, the Fearlessness shape, and you notice your breath is even and your shoulder is soft. He cuts. You don't watch the blade; you watched his shoulders load a half-second ago, so the cut is already late news. Your palm draws its slow flat circle in front of your chest and the wooden edge meets the curve and runs off it, sliding past your ribs into empty air. Your hand is still moving — the circle doesn't stop because the attack is over; it just keeps turning, ready. He resets. You never tightened. Nobody got hit, and your arm is no more tired than if you'd waved.
Dukes's sources are the esoteric mandala iconography (the Amoghasiddhi quarter, the on-guard Vajramukti figures), the mudra catalog (Semmui In / Segan In), and his lineage reading of Sarvastivada transmission. The Senjutsu redefinition is a practitioner-doctrinal claim, not a philological one: he asserts that "within the fold of Buddhism" the word meant non-harmful defense, against its ordinary martial meaning.2 No external citation pins this; it rests on his temple's reading of the art. Tag it [PARAPHRASED] and note the redefinition is his interpretive move, defensible but not externally corroborated here. The Sarvastivada-transmission claim he himself frames as probability — "the most likely candidate to have transmitted, or at least influenced" — not as established history.9 Preserved as a likelihood, not a fact.
Open: is the non-harm doctrine descriptive of how the art was actually used, or prescriptive — an ideal the art was supposed to embody and often didn't? Statues of guardian deities in combat stance suggest the art protected temples by force when needed.
Dukes is reading fighting technique out of devotional iconography, and you can feel the weight he asks a frowning statue's finger-angles to bear. He insists the carved positions are "always accurate even down to subtle details such as the positions or angles of finger phalanges" — drawn from something the sculptors actually witnessed, not imagined.12 That is a strong evidentiary claim resting on his own connoisseurship of the art; a historian outside the tradition would want a chain of custody he cannot fully supply, since the decisive lineage knowledge lives in his temple. Where he converges with the vault's critical-historical corpus: he is candid that the Sarvastivada link is a probability and that the early references are sparse. He does not pretend the transmission is documented. The honest hedge sits right beside the confident reading — both preserved.
Redirection Not Resistance — Influence manuals teach that meeting force with force escalates, while redirecting an opponent's momentum costs you little and leaves him overextended. The Parivrttapala circle is that principle rendered in the body: don't block the push, curve it past you. The structural parallel is exact — both treat the attacker's committed energy as a resource to be steered rather than a wall to be matched. But the insight neither domain produces alone lives in the non-harm clause. Behavioral redirection still aims to win the exchange; the redirected opponent ends up worse off, which was the point. Dukes's Senjutsu redirects so that no one is harmed, including the attacker.2 Run influence-judo through this page and you get a question the manuals never ask: what would a redirection look like whose success condition is that your opponent is unhurt? It exposes that "use his momentum against him" still smuggles in the word against. The Buddhist version deletes it.
Threat Detection and the Startle Reflex — The startle reflex is fast and dumb: a sudden threat fires a whole-body clench before the cortex knows what happened. The Semmui In trains the opposite — "that which experiences fear no longer exists," a body that stays loose under attack.8 The parallel is that both are about what the nervous system does at the instant of threat. The tension that produces new insight: psychology treats the startle clench as protective, the body armoring itself. This page shows the clench is the failure mode of defense — a locked arm cannot draw the circle that actually saves you. So the fearlessness mudra is not bravado; it is a deliberate override of a protective reflex that, in this art, gets you hit. Neither the trauma literature (which prizes the protective freeze) nor the martial tradition (which prizes the calm) alone tells you that the protective reflex and the effective defense are in direct competition for the same half-second.
Sharpest implication: a fighting art can take "do no harm" as its core tactical instruction, not its moral footnote — and the most effective defense turns out to be the one that adds the least to the violence.
Generative questions: