Play the game with two people, one being the Avenger and one being the Judge. After you both gain your second Edge (Smite and Burden) find a location with a lot of zombies. Have the Avenger use Smite and immediately after that, have the Judge use Burden to freeze the already dead zombies. When they unfreeze the zombies will be invincible.
Sound Test
Press Left, Left, B or Right, Right, B during gameplay.
