In order to do this you must have the following: Charge Beam, Power Bomb, and at leats one other beam ability besides the normal one (Ice Beam, Spaser Beam, Wave Beam, or Plasma Beam). Select ONE of your beams (Note: the normal one will not work), and the Power Bombs. Charge the beam until a "shield" flies around you. Every use will cost 1 Power Bomb.