Slows you down, causing you to crash. OR The carrot rocket will hit your plane. EDIT: 1. Ineffective? The point of this plant is to cut through zombies through the Zs' heads. (Imagine how deadly it is.) 2. Step 1 is unnecessary. Laser Beans only attack lower grounds with its plant food upgrades (though in PvZ 2 it attacks the air zombies as well).