For every bullet fired, the player's shields, or vehicle armor will drain by a small amount. However, this does not apply to health. This can prove very difficult as it is hard to multitask aiming and firing with checking your shield strength.
- When combined with the Hollow skull in Halo: Spartan Assault, it forms a lethal effect; the player can commit suicide by simply shooting for too long. This is quite easily the most difficult combination of skulls in the game, but aptly it also provides the highest multiplier.