Jacksepticeye and Markiplier ego's at school

You sit down by Dapper but he climbs over you for the aisle seat, you ride for a bit having no issues when the bus stops and three big guys get on. The one in front is huge, while the other two seem to be twins but are much smaller. The three walk by Dapper and the front one says "Hey can I borrow some money" Dapper doesn't notice and the leader takes this as a mockery of his pride. He grabs him by the hair, gets his attention, let's go, and takes a swing at his face. Suddenly his fist comes into contact, but not with Dapper, no instead it's Anti's hand.

What do you do?