Something I found about a year ago but never made a video of (same for the bonus OoB).
Holding the fire button for this weapon keeps you in this locked first person mode. If you can grab a ledge in this state, you can change your angle and go up into walls and go out of bounds.
This is possible in almost every battle stage. Some of these however have no solid ground out of bounds and there's no such thing as a respawn mechanic, may you go outside the intended boundaries. You simply softlock. There's no use for this in speedrunning and very little use in competitive matches.
There are 171,445 views in 15 videos for Rayman M. His channel uploaded 4 hours worth of Rayman M videos, roughly 1.18% of the content that KirbyComment has uploaded to YouTube.