I was confused back in chapter 20-1. But Kc probably explained it, being the literary genius that he is. Datu stated that he went to the new guard room on the 5th floor by Lizzy and Steven. But then, at 3:14 he says Burt enters from the 3rd floor, and he confronts them. What happened to the 4th floor? I didn't understand how he came from the 3rd floor into the 5th floor, without anyone moving.