Two explosions woke up Paul, he rubbed his eyes and got up. The zombies were still down there moaning at him, clawing the wall trying to get up to him. 'I could use some grenades', he said to himself. He recognised the explosions as grenades but he was half asleep and couldn't tell how close they were. 'I wonder if anyone will here this', He shot four shots that splattered brains all over the other zombies who didn't seem to mind the fact that four of them were just shot down, "well of course they wouldn't mind, they're brainless corpses", he thought as he watched them step on the fallen bodies which soon disappeared under them.
Paul could still here shots being fired but they echoed off the walls and he couldn't make out where they were coming from or how far away they were. He checked his belt, 'Damn!', his ammunition must have fell as he climbed up here so even if he wanted to drop them one by one it was hopeless. He took out the remaining ammunition from his gun, he only had twelve bullets left and at least three dozen zombies down there waiting for him. "Maybe whoever made those explosions had heard my shots, worst case I wait for morning, someone's bound to notice a group of zombies causing a ca-motion around this freak'n building."
There wasn't much els for him to do, he could barely see thirty feet ahead of him so he was stuck here for now.