git:20260912.856bfab to git:20260913.43ccc40

15 added, 5 removed. Audit A to A.

---

name: knockback-launch

- description: Knockback and launch after hitstop. Gravity is data. Use for 击飞, 击退, 浮空.

+ description: Use when hits need authored pushback, launch arcs, gravity, airborne stun, or juggle trajectories after the applicable hitstop policy resolves.

---

# Knockback launch

- Apply when hitstop hits 0 (`action-feel`). Vector + gravity + air-stun live on the attack, not on the clip length.

+ This skill owns intended launch parameters, not body collision response.

- Ask first: ground-push, launch-arc, or splat (`wall-splat`).

+ Choose:

- Rules: same clock as hitstun (`hitstun-recover`). Juggle height is a combo-graph budget (`combo-design`). Enemy and player use the same formula (`enemy-kit-balance`). Camera follows without clipping (`camera-anti-clip`).

+ | Mode | Output |

+ |---|---|

+ | ground-push | planar initial velocity/impulse plus decay or stop rule |

+ | launch-arc | initial velocity/impulse, gravity and airborne state |

+ | custom-trajectory | explicitly authored curve/solver when the project requires it |

- Accept: a medium does not bury, a launcher leaves a published window. Training draws the arc.

+ Publish whether launch begins immediately or after participant hitstop reaches the required state. Store vector/impulse, gravity, air-stun and any air-control rule in gameplay data, not animation clip length.

+ `knockback-body` owns wall/floor sweeps and stop/slide/splat response. `hitstun-recover` owns action lock/recovery. `combo-design` owns juggle-route budgets. Player and enemy may share a formula, but symmetry is a project choice rather than a universal rule.

+ ## Accept

+ For each representative launch, log initial state, launch tick, velocity/impulse, gravity and expected contact window; replay it at different render rates. The measured arc is stable, and changing animation duration does not change physics. Collision penetration is validated separately by `knockback-body`.