Felton's built like a penguin, he just uses his broad shoulders to to create space on smaller guards like Bradley and waddles to the rim/paint.
But really it was just Bradley playing poorly, his offense was non-existent and he was frustrated with trying to bring up the ball and dealing with the Knicks pressure offensively.
Because overall Felton hasn't done much against Bradley except for that playoff series. In the regular season he only has one decent game when both were rotation players.