Your erratic movements disorient your opponent.
If you successfully use Acrobatics to tumble through an opponent’s space, you gain a +2 circumstance bonus on attack rolls against that opponent until the start of your next turn. If you choose to make a trip attempt against that opponent, you gain a +4 circumstance bonus on your combat maneuver check. This bonus on trip also lasts until the start of your next turn.
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Sources:
SECTION 15