Using the distraction your attack provides, your beast companion finds a better position.

At-Will   ✦     Beast, Martial, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 1[W] + Strength modifier damage.
Increase damage to 2[W] + Strength modifier at 21st level.

Effect: Before or after the attack, your beast companion can shift 1 square.

Published in Martial Power, page(s) 43.