Giles is luckier than Luke. The staff waited until the morning after
this to call him in. All the way 'til ten o'clock. The night doctor's plan was for the cannibal to sleep off his fit along with the tranquilizer, in four-point restraints on an infirmary bed, and then simply send him back to the cells.
Of course, Simon throws a wrench in that by waking with yet another yell, dizzy from the drugs and trying so hard, and failing, to hide how desolate that brief, too brief contact with his own kind has left him. He's fine with just staying here, ignoring the staff and everything else, staring at the ceiling, and plotting the route out from here.