It was better than nothing- he knew he wasn't exactly being subtle, but he also wasn't taking this completely seriously, to be honest. He was fighting a giant humanoid turtle, how could anyone take that completely seriously?

"You're the one takin' it personally!" he snapped back, his voice exasperated. "It's part of the fuckin' game, numbnuts."

Bro took a few steps back, evaluating his options. He really just wanted to fucking get this over with, and it would be a little easier if he had something to fucking attack with. If he could just get his knife back, he'd be better off. Maybe if he just waited for Don to make the next move, an opening would present itself.