So, the 1st level Warlord encounter exploit Leaf on the Wind lets you or an ally swap places with an adjacent enemy. Since that is a "swap," it's NOT a push, pull or slide, and thus it is not one of the moves immune from Opportunity Attacks. So, if you are adjacent to both the enemy and the ally, and a swap leaves the enemy adjacent to you, does it provoke an OA? (Or the ally, if the same facts apply and you switch.)