What it looks like when someone with training fights people who have none.

The guy knocks the second dude out with one left hook.

Without knowing what was being said, it’s hard to know who was the instigator. Remember, when two people are threatening you (as is likely from the evidence), it doesn’t pay to be timid.

The guy doing all the dominating looks like he had standard boxing training, not krav maga or other similar martial arts. He uses very effective, well-aimed punches (most people with no training miss more than they hit due to adrenaline).

By the way, he deliberately misses with the kick at the end as he wasn’t sure if the second guy was disabled or not. He was already kicking when he turned around, but once he realized that the second dude was no longer a threat he pulled the kick up so as to miss, showing his goal was mostly to disable his potential attackers and get out of there.