He did look a little affected by Cotto's pokerface. Cotto has only one look and I think it got to Floyd if only for a moment. Sometimes pokerfaces **** you off.
pretty much the conversation was that floyd said he was the best, cotto replied by saying no. they pretty much repeated this but with different words.
Yeah Mayweather said 'you're ****ing with the best'. Cotto shook his head and said 'no I will be the best' and they repeated that again and again. Floyd was a bit unnerved IMO by Cotto here but he has been before. Floyd often looks a bit nervous during weigh ins. It's one reason he's so sharp - fear kills some fighters and makes others sharp as hell and very aware of what is going on. Floyd is the latter kind of guy.