With supreme effort, you escape.

Encounter   ✦     Martial
Immediate Reaction      Personal

Trigger: An effect immobilizes, restrains, or slows you.

Effect: The triggering effect ends on you. You then shift up to 2 squares.

Update (10/4/2011)
Updated in Class Compendium.

Published in Player's Handbook, page(s) 127, Class Compendium.