The question is so brazen and direct that Leonard feels almost cornered about it. And people like Leonard don't really do well with feeling boxed in over anything. That, and probably a little help from the copious amounts of alcohol running through his system, has his defenses up almost immediately.

"I don't-- I don't know, okay?" He snaps. "I can't explain it, I just- I can't handle it," That isn't really how he meant to phrase that and it's obvious with the way he absolutely barrels on with the rest of what he has to say. "People change, Mick, why does it have to have a reason?"