According to Top Rank vice president, Todd duBoef, Santiago then told Roach, "One-hundred-and-forty-five-pounds [a******]" as he emphatically continued to gesture at his own fighter and the scale.
Roach, apparently incensed, turned and pursued Santos across the stage.
"I'm watching Miguel Cotto make weight, and then he makes weight, and then Santiago says, '145-a******.' And I said, 'That's how much he's supposed to weigh, and don't call me an a******, or I'll [expletive] kick your a**,'" Roach told FanHouse after watching an exclusive FanHouse video.
"And then, Miguel starts staring at me, and I said 'What are the [expletive] you looking at?' And I decided to calm down a little bit, because the last time I hit somebody, it was a Kinko's, and I got sued," said Roach.
"But when somebody calls me an a******, I'm not going to just keep my mouth shut," said Roach. "I mean, 145? That's what he's supposed to weigh."
Trainers Steal Show at Weigh-In -- Boxing FanHouse