This page auto-runs on load: it records which service worker (if any) was controlling the page, unregisters it, disables the hero watchdog flag, then attempts programmatic playback of the hero clip with no tap — exactly what Home/Train do. Report what the log shows.
Disabling the watchdog sets a flag the Home/Train heroes respect on next load.
Spotted a bug or have an idea? It goes straight to the Fade team.