Miles while the 2nd round was great the 3rd round was probably just as revealing. If you watch the 3rd round again, you'll see Mayweather is psychologically 'playing' with Mosley. Goading him...

Mosley's jab to the body (which would of proved to be vital as a set up punch) disappeared after just two rounds and about 15 seconds. How did that happen? He got beat psychologically.

There was a point ( about 30 seconds in) were Mosley jabbed downsatirs in round three and Instead of just countering with a right over the top, Mayweather threw a 1-3(sidestepped) and a 2 for good measure.

Mosey didn't know what hit him. But he stopped jabbing downstairs with any conviction.

After that Mosley REALLY had to think about what to throw next and so Mayweather 'had him'. After this you can see the whole though process: Mayweather is showing Mosley that he is too slow and that in what ever way he pressed, Mayweather had a punch or two to answer with almost preemptively.