I see a lot of people talking about this fight was changing, and that Salido was warming up. I will watch this fight again, but that is not what I saw at all. Yes, Salido was getting inside a little more frequently, but he was very ineffective when he did get inside. I think you all are misconstruing desperation(cause that's EXACTLY what it was)as Salido effectively getting inside Mikey's reach/zone of comfort with a planned attack predicated off of a mid-fight adjustment.
He(Salido)did nothing to "get inside" other than throw caution to the wind, as he already knew he was horribly out-classed on the outside, and was unable to find a responsible way to get in on the inside where he figured Mikey didn't want to fight(which I do believe he was right. Mikey didn't want any part of the inside game. And who could blame him if he was having so much success on the outside, and dictated every aspect of the fight. e.g. pace, tempo, geography of the ring ect.......). This fight was not changing for the better for Salido, he was well on his way to being KO'd before the headbutt took place.