Tangle UpFighter Utility 16
When your enemy lowers its guard, you take the opportunity to tangle its feet and send it sprawling.
Encounter ✦ Martial
Free Action Melee weapon
Trigger: You hit or miss an enemy with an opportunity attack
Target: The triggering enemy
Effect: You knock the target prone. You mark the target (save ends).
Published in Martial Power 2, page(s) 16.