Hit: "2[W] + Strength modifier damage. You or an ally adjacent to the target swaps places with the target.[PH:145] You (only if you are adjacent to the target) or one ally adjacent to the target can take a free action to swap places with it, sliding it 1 square and shifting 1 square."[Dr397:17]
Leaf on the wind is an encounter power available to warlords at 1st level.
The "Class Compendium: Warlord" article in Dragon 397 changed the movement effect of leaf on the wind to require a free action.