Since this can activate off of defense-labeled abilities, such as Hero Interrupt (defense):, this can act as a little bonus -2 ATK for every (defense) event you play. Fire off two such events and the enemy gets -4 ATK without your hero needing to do a basic defense.
For example, using this with Cuts Both Ways and Defiance gives them -4 ATK, you gain retaliate 1, and discard a boost card for 2ER, which should shut down almost any villain's attack without you having to exhaust. With Flow Like Water and Electrostatic Armor, that would deal 4 damage back. If you have the resources for Powerful Punch also, that's 9 damage for the villain daring to raise a fist in your direction.
This is a solid one or two copies addition to a perfect defense deck imo.