After some pointless dialogue, he attacks you with his sword. Quickly jump and draw your shield. His sword deals 35-45 damage and his gun 15-30. Hold your shield. From here you split into 2 possible strategies. First one: advance with your shield on, and attack him with the sword; then fall back and repeat. Or the other possibility: the same with the shield except use Zeusea. Both strategies may adopt grenades but usage of the blaster, even the Photon Charger is not advised. When he gets to 50% life, he congratulates you and leaves, giving you a Power Boost. He can also launch barriers of bullets which you will desperately need the Green Shield (or at least the round one).