Ok, back to it

Story: After running into the building, you wait a little. You wake up to a rumbling noise followed by demonic screeching. You slept, and it was for too long. However, the rumbling is the passing of the zombie horde, so it seems hiding was a good call. However, in your sleep you forgot to barricade the broken door, so you notice a police officer undead slowly walking towards you. You can run, but then you see a gun in his hand. These things are smart, enough to pull a trigger. However, if you make it to him fast enough you might be able to grab the gun, giving you a better weapon.