"Magic" can cover anything. It's a bullshit explanation for whatever technology or skill won't do.

[so if this guy's seen something that even magic can't explain, that's disturbing. luckily leona's not the first person to mention magic in this place, so he's already had his time to scoff about the idea. his own world has some superpowers that could seem like magic spells, yet magic's nothing but fictional stories to superheroes. waving your hand and making everything go away or fix itself? yeah. if that shit exists here...]

So you don't have enough knowledge, power, or skill to make an escape work. [bakugo gets the quicksand comparison, and he's smart enough not to bang his head against the wall trying to do something that's impossible at the moment. if that's what leona's discussing, then they need to know more before striking back.] If you haven't given up, then what are you still doing to fight back?

[he arches a brow at the question. up his sleeve?]

I just got here! If I could blast my way out, then I would've! [ka-boom! he detonates a basket-ball-sized explosion in one hand, angry and showing off at the same time.]