You decide that someone trying to run away probably took the stairs. You hurry into the stairwell and start to climb. You look up, searching for any movement, and think you hear a door close above you. You pick up the pace and try to figure out which floor that way. You make it all the way to the top floor and start searching. Floor by floor. But you never see the teen. You also never see Greg. You make your way back home, planning to search for Greg online or maybe just drink until you forget about your wasted day. You open the door to your apartment with a lot less energy than you had when you left it.