You twist and lean into your weapon just as your opponent tries to pull away, rending flesh and bone.

Encounter   ✦     Primal, Weapon
Immediate Interrupt      Melee weapon

Trigger: An enemy leaves a square adjacent to you

Target: The triggering enemy

Attack: Strength vs. Fortitude

Hit: 4[W] + Strength modifier damage, and the target takes 10 damage if it moves more than 1 square during the movement that this attack interrupts.

Published in Player's Handbook 2, page(s) 60.