It was a legit knockdown, punch caused him to fall off balance and his glove touched the canvas which held him up, red didn't catch it. Didn't matter though, Judah faded, or I should say Mayweather adjusted. First round rounds Judah was in control, after that Floyd took over. That's one of Floyd's best strength - the subtle adjustments he makes after the first few rounds. Once he learns about his opponents speed, accuracy, tendencies, which he picks up really quick, he then knows just the right amount of distance to keep and whether he needs to use his feet and pot shot (i.e Guerrero) or stand in the p pocket and walk guys down (i.e Mosley). I believe Pacs style will be more tricky for him though.