That's called timing and beating someone to the punch. That's not a counter. A counter punch, begun immediately after an opponent throws a punch, exploiting the opening in the opponent's position. Plus, Pac threw his right hook before Hatton threw his left.
I don't think it's a clear answer one way or another. A first glance it doesn't look likt a counter, as Manny began his punch first... If you assume he was waiting on an indication that Ricky was about to throw a punch, then you might have a point. Argument could be made either way.
err isnt that a counter supposed to be time ur opponents punch to throw yours? you know your more vulnerable while throwing a punch? no, pac knew hatton is gonna throw that left. look more closer.