It just caught Mayweather on the blind side so it caught him by surprise and it stunned him nothing more nothing less he was dazed and it only took him about 10 seconds to recover. Also if i remember right i remember Mayweather getting caught really flush in one of his early fights against Miguel Melo.
I don't think Pressure is out of the question but i do think no one thing beats Mayweather, you need at least 3 different tactics mixed in with pressure fighting, unless your someone like Vernon Forrest or Thomas Hearns who can use there natural physical advantages over Mayweather.
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