Irving would probably try and talk the guy down, though given his old team dynamic said talk would be interrupted by the rather bad-tempered energy projector shooting Psychoticguy in the face and then pummeling him, in which case Irving would try to save the kitten. And if he didn't, he'd feel awful for days, probably just trying to console himself that at least it wasn't a human child (while Irving is not human himself, he tends to place somewhat more importance on the lives of fully-sapient beings, if only because you can have great conversations with them).