Its all leverage.Mayweather does it with his forearm....Roy jones does it with his shoulder.There is always head contact...but was it intentional no.Look at what happened to Malignaggi's eye.Cotto likes to constantly apply pressure.Urkal fights hunched over..its a fact.Cotto takes a hard step in to either punch and even when he isnt punching he is stepping forward to close the distance.I dont see how else I can explain it.