RICOCHET
If you shoot this gun correctly then the bullet will bounce off that beam up above us and then hit that dustbin. It will then ricochet into the pile of bricks on the floor and then ricochet back against that plank of wood that is leaning against the wall. It will traverse those crates and bounce off the opposing wall into that fridge, onto the ceiling and then straight down onto that zombie’s head, thus killing him!
Or you could wait until the zombie gets a bit closer and hit it with a stick.