Oh I dont know, throwing a punch and aiming there? It isnt rocket science.
The early shots to the back of the head, before Floyd started holding or using the forearm, had nothing to do with Floyd holding or turning into it. That is where Maidana threw them and where they landed. At one point he was holding Floyd around the neck while punching the back of the head. Care to explain how that is also Floyd's fault?
So back to your logic, Maidana is the one who started the dirty shit and Floyd, again by your logic, did what he had to do to handle it.