Roach threw a couple more shots at the Mexican Thursday by saying that Barrera should be asking himself only one question, and that’s “How can he beat Pacquiao?” next Saturday at the Mandalay Bay.“Barrera can’t outsmart or outfight Manny Pacquiao. So what he’s going to do is he’s going to use his head,” said Roach who had warned his boxer of possible head butt – accidental or otherwise.“I just have the better fighter,” he continued. “But Manny Pacquiao is such a gentleman, such a sportsman that if he gets head-butt, he doesn’t head-butt back. That’s...