Every Green Lantern should be able to face the worst creatures of the galaxy, and Parallax is one of them. The most terrifying creature of our world won't spare his attacker. Switch between weapons in time to block his attacks and shoot in response.
What would you do if you faced Parallax in the equal fight? His terrible powers is strong even for the members of Green Lantern and if you make a mistake, there won't be a chance to survive the battle. Get on the battlefield and face your enemy, switch between weapons to block his attacks and shoot while he reloads his weapons. Don't let him win this fight!