We decided that if ground units could cut a leaf free for an attack, or just sit on the leaves for a little farther shot in to the battle, it is only fare that a swooping bird be able to send those precariously placed mice drifting into the sky as an attack also.

Cutting a leaf- when a bird makes a swoop attack on a leaf space that is not drifting, it may apply 1 hit rolled to the leaf. The leaf may not defend. After the swoop attack is completely resolved, if a hit is applied to the leaf the player who attacked may set the leaf drifting following normal rules.