- a rider's effects are stored in the deck's frame: standing still on the Thunder Bluff lift, a weapon enchant's streak hung four yards below the blade and through the floor, because its edges were laid down in world space while the car climbed out from under them — the reference folds the transport matrix (translate · Rz(facing), NULL on the ground) into the emitter at birth and back out at draw, so committed content rides the deck and only a boundary re-expresses it; a `RideFrame` on the rider's model, inherited down the parent-model chain the way the reference copies the transport pointer to every child each frame, one fold at birth, one at draw, one at the boundary — ribbons take it unconditionally, world-mode particle clouds take it, model-mode clouds never see it; measured on the car: streak 4.2 yd → 0.00 over a 49 yd climb, while the same rider thrown off the top streaks 0.9 → 24.8 yd on the way down
- switching away from the window while riding a lift dropped you through it: a collider moved in `Update` is invisible to `Update`'s own spatial queries until the next physics step, so on a 1 s frame the deck descended 7 yd with its broad-phase box left behind, the ground probe found nothing under the feet, and the second long frame's clamped 250 ms of gravity put them under the deck; avian's own `update_moved_collider_aabbs` now runs inside the transport chain right after the deck moves (0.03 ms p50, flat across scene density), and `WOW_STALL` injects long frames on demand, since a probe window is never throttled by the OS
- `WOW_TRAIL_CENSUS` prints each live ribbon trail's world-space spread beside its spread on the deck — the pair that separates "not riding" from "riding but not folded"; it first matched zero trails in every scene by requiring a component trails deliberately never carry, recorded rather than quietly fixed, because an instrument answering a confident zero cost an afternoon
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
