This trick allows you do endure a hit that usually causes knockback effects when using Ike. When about to be hit by an objects such as a smart bomb, press Up + B to do Ike's special move, Aether. Your sword must still be alone in mid-air when hit. If done correctly, you will continue to jump upwards toward your sword after the hit has landed and finish the move. This is very useful and can be much easier to time and execute than sidestepping.