Your foe chooses to ignore you, receiving a solid blow from your shield as thanks.

Encounter   ✦     Martial
Immediate Interrupt      Melee 1

Trigger: An adjacent enemy marked by you shifts or makes an attack that doesn't include you as a target

Requirement: You must be using a shield.

Target: The triggering enemy

Attack: Strength + 4 vs. Fortitude
Increase to Strength + 6 vs. Fortitude at 21st level.

Hit: The target is stunned until the end of your next turn.

Published in Martial Power, page(s) 33.