Even as your target ducks under your shot, the projectile moves on its own to find another enemy.

Encounter   ✦     Primal
Free Action      Personal

Trigger: You miss a creature with a ranged attack

Effect: You make a ranged basic attack against an enemy within 5 squares of the creature you missed, using that creature's space as the attack's origin square.

Special: You regain the use of this power when you spend an action point.

Published in Player's Handbook 3, page(s) 118.