Throws a knife through the barrel

At one point, the watchtower sees the gleam from one of their weapons and aims to snipe them down, but both Priest and Mary react, aiming to shoot down the bullet and kill the sniper. Priest’s cross bolt moves slightly quicker, ricocheting off the bullet and killing a border patrolman on the ground. With the bullet out of the way, Mary’s throwing knife makes its way into the barrel of the gun, through the barrel of the gun, and through the head of the sniper.

Chapter 18, The Sting of Death