Mituna didn't say anything back, he just kept looking around in the garbage bin. He was trying to find something, and he didn't know why. It just felt like it needed to be done... Well, he is Mituna. He can't help a lot of the things he does.
"You know what you are? Selfish. I've done nothing but sacrifice to get us here, and what have you sacrificed? Nothing. Zero. All you've done is boss me around - well now who's the boss? Who's the boss? It's me."