Marcus shielded himself with his arms from the horde of bullets that Tony was spawning. He looked at Deus who was probably going all out. Marcus didn't want to rely on his Paladin mode to much......he had to keep that ability a secret until the moment was right. He couldn't do anything but change his nullify ability to his proximity. So that's what he did canceling or weakening magic near him. He drew a square in the grass and punched it picking up a cube like shape and hurdling it towards Deus to get an example of how that demonic energy of his works.