[Tony listened impatiently as Katsuki answered, though it was frustrating when so much of it he got wrong. He was all ready to point that out, but that last part caught his attention like a semi-truck's horn.]

Ah-ha! That's what this is about. This isn't about me or this mission! This is why you're always so angry. Who did you let get hurt? Who weren't you strong enough for, kid?

[He held back the vial. If Katsuki wanted this, he needed to answer that question.]