@Fattie If I recall correctly, he displays some extra-terrestrial knowledge that he ought not have, but throughout the movie he is generally presented as a mental patient who simply believes he is an alien. Until the end, when he is not.

On some one else maybe, but there is also a force power that lets you basically hold your own breath for a very extended period of time. starwars.fandom.com/wiki/Breath_control

@user I’m guessing Yoda would have skewed any attack as simply defense.