The Princess struggled to recover from the force of the blow, but she sent out a wave of energy to knock her attacker away. She fell into a nosedive into the tree-line, forcing the skeletons to pull up and abandon their all-out attack. Luna pulled up and soared between the trees, often tucking her wings in with unnatural agility to avoid hitting the trunks. As to how she didn't lose any lift, Twilight had no idea.