Your attack leaves your foe with no idea how to escape its position between you and your beast.

Encounter   ✦     Beast, Martial, Weapon
Standard Action      Melee weapon (beast 1)

Target: One creature

Attack: Strength vs. AC

Hit: 3[W] + Strength modifier damage. If you and your beast companion are both flanking the target, the target is immobilized until the start of your next turn.

  Beast: If your companion is a boar, a cat, a raptor, a spider, or a wolf, the attack deals extra damage equal to your Wisdom modifier.

Published in Martial Power, page(s) 56.