He's learned by now what cooking is, and can in context figure out what a fish is, but 'mutant' is a word he can't connect to anything. Why wouldn't a demon fish look like a weird fucked up monstrosity?

"I guess." Heat will try anything edible at least once, and if in Agni's form quite a few inedible things too. Why everything needed to be cooked, he didn't know. Fresh was better, wriggling better yet. "How are you getting them to stick to the string?"