Your arrow saves a falling friend by pinning him or her to a nearby wall, or presenting a sudden handhold.

Encounter   ✦     Martial
Immediate Interrupt      Ranged weapon

Requirement: You must be wielding a bow or a crossbow.

Trigger: A creature in range falls and has a wall or floor within 1 square of it

Target: The triggering creature

Effect: The creature can attempt a saving throw to avoid falling farther. If successful, you can slide the creature 1 square to a horizontal surface, or to a vertical surface that the creature now climbs.

Published in Dragon Magazine 383, page(s) 50.