Wow; I have never seen males fight like that. I would think that it'd be uber stressful.. I don't know much about the whole practice so I can't really say much.. but yeah, like Lawrence said.. that they just came across them fighting. Housing snakes together is never a good thing (breeding pairs aside..) But like I said, I am not qualified to weigh in much on male combat for breeding purposes.. never had to resort to it.