I couldn't sleep so I was watching Welcome To The Hellmouth last night. Keep in mind it was like 3am so my mind might have been a little warped. But, when Buffy checks the body in the locker room and then goes to Giles, they talk up in the stacks. Giles comes out of the exact place that Xander later appeares from. Wouldn't they have seen him or known he was there the whole time? Did anyone notice?