Jungle (2014)

Thirty-year old guy is assaulted on the street. Randomly, in the middle of a day. The emotional damage hurts him more than the punches taken. This is a new experience for him. The guy tries to sort things out between justice, revenge and a bit of shame. Meanwhile, on the opposite side of the story there are guys that did the beating. They practice first-punch knockouts. And they helpfully carry their mothers' food bags in the evening.