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There is a Legacy version here.

PFS StandardAggressive Block [free-action] Feat 2

Fighter 
Source Player Core pg. 141 2.0
Trigger You use the Shield Block reaction, and the opponent that triggered Shield Block is adjacent to you and is your size or smaller

You push back as you block, knocking your foe away or off balance. You use your shield to push the triggering creature, either automatically Shoving it 5 feet or causing it to become off-guard until the start of your next turn. The triggering creature chooses whether to be moved or become off-guard. If it chooses to be moved, you choose the direction. If the Shove would cause it to hit a solid object, enter a square of difficult terrain, or enter another creature’s space, it must become off-guard instead of being moved.

Aggressive Block Leads To...

Flinging Shove, Powerful Shove