The brief asked which of two declared events the human sees. Neither. With no
input the sweep pair enters 34 frames (f6b) and 67 frames (f6) before
ptcopyright -- 0.057 of a sweep loop in both, agreeing to 1.2% across runs
that differ 2x in frames. With A pressed during the build-in the separation
is 2 frames.
A reveals the plate and restarts both sweep leaves at t=0 in the same frame,
so a player who presses A sees them start together and reports exactly that.
The control that makes it an explanation: in the late-press run A landed
after the sweep had already started naturally and the two are 29 frames
apart -- same input, opposite result, decided by when the press falls.
Consequence for the port: do NOT start the sweep with the plate. That fits
one boot and breaks the other. The declared gate plus the snap restarting
leaves produces both observations with nothing authored.
Refutation attempt: looked for a case where the port's current behaviour
fails against these four captures; found none.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t
eea55b9900