Switching to his shotgun, William went under some debris. As the monster charged for the civilian, he aimed and shot it while it passed close by, buckshot sent flying. Hopefully it paid off. If not, he was screwed. But he had Xav to watch his back. Hopefully he was a reliable shot and actually hit. But he was a sniper, so he probably would. Damn he was good with a rifle.

If all else failed: LMG.