User blog comment:TheNewProtagonist/Vol. 2 Episode 1 - I just.... why?/@comment-5999656-20140727022250/@comment-2006510-20140727043750

But that's sorta Monty's thing; his animation eats physics for breakfast, or they're so cool physics themselves just step back and watch. You'll never enjoy it if you expect realism from it

And as it's been explained, their Aura can channel through just about anything, including food - as ridiculous as it sounds, they can eat it one second, then have it be hard enough to crack watermelons. It's a highly background thing, but it exists.

And yes, it's polarity, but this is a different universe; how are we to know what their cans are made of?