What if exactly 14 zombies were coming from both sides?

But we were talking about a situation where you find two guns.

Then pocket the second gun until the first runs out. If you've got a buddy, get the zombies coming through a fatal funnel. You shoot straight at the funnel while your buddy reloads the inactive gun. This allows you to maximize accuracy while the lead never stops flying down the hallway (until you run out of ammo).

But there are zombies on each side of you, and your "buddy" is just some chatroulette guy who can't help you.