Altercations usually happen because of an argument, or some type of beef between the individuals. Regardless, both parties usually have malicious intentions towards each other, and are not in a right state of mind. Without training, they will usually flail their arms around like a fish out of water hoping to land a hit, as their adrenaline pumps full force.
With adrenaline, an individuals starts to get tunnel vision and they get overwhelmed by the increased blood blue. Getting in between an altercation like this is potentially dangerous for all parties.