In indoor track practice, our 2 best half-milers, who were always very competitive with each other and both volatile to boot, suddenly started whaling away on each other and were throwing fists for about a minute or more before our coach came up. They saw him and stopped. Coach said, "don't stop on my account, I love a good fight, I wanna see who wins." They both glared at each other for almost 10 seconds before it became clear that there would be no more fighting. They had gotten a LOT of punches landed in that minute or so. Doesn't sound like a lot of time, but when 2 strong determined pissed-off guys are going right at each other, they can do a lot of damage in a minute. Coach saw they weren't going to resume and told them both to shake hands and that there better be no more of this or they were both off the team. They never fought again and actually became very good friends.