Was watching a group of impala near a waterhole and was about to move on, when I saw two males start to stamp the ground and start to head butt each other...they were just starting a stronger tussle when suddenly from the sidelines runs a third male (just like a bar bouncer breaking up a brawl). He almost bowls them over, and then as quickly as it started they all went back to business as usual. Taken in Kruger National Park South Africa.