[from
here]
The first thing Spider noticed after charging into the hallway and almost skidding into the far wall were the stairs. Stairs were not usually a good source of information (generally people and computers were better) but in this case they were invaluable. These stairs went downwards. There were no stairs going downwards on the first floor, which was where he wanted to be. But there were stairs going downwards on the second floor, which - after some consideration - Spider decided was where he'd gotten all those drugs he'd been on when he'd come here before. Thus, the course of action was clear: DOWN THE STAIRS!
[to
here]