There were 2 cameras at the NE? Yes. One was directed down the north hallway,
and the other? One was looking west, which is the one that first recorded SP coming out of 8 and running a hand down the wall. Was that the camera that caught SP coming out of Rm 10? While the first cam looked west, the second cam looked south. And yes, that’s the one that caught SP coming out of 10.
Did that camera track the east hallway? We didn't see much of that hallway at all. It does. But there isn’t much to see from that end. You can see down to the other room 10 door. Beyond that is 11, 12 and 13 on the left and 14 on the right. I don’t know if when SP came north along that hall he got close enough for the camera to activate or not. Presumably he went in the first room 10 door.
I'm wondering why, after coming out of 10, he started on the doorway across the hall from 10 and they only showed a bit of it. That camera should have caught SP heading (toward) N in the east hallway and then going away to the South in the east hallway. Good question. They zoomed in as SP was hammering room 9 in order to show the object in the left hand. Maybe the camera stopped after SP entered room 9 and did not activate quickly enough when he left and turned South? Or, Maybe he left the object in room 9 and police edited that out to preserve it as something only the killer would know. Btw, I think this answers your question at the end below.
We know he headed South in the East hallway and turned the corner into the South hallway and headed west still clutching that silly tray. No, SP does not still have the tray after they “pop back up” walking toward the camera and turning right toward the auditorium. I'm wondering why he didn't go west in the north hallway after coming out of Room 10 and try to go into the auditorium that way. But he doubled back and entered (or so we believe) the auditorium there. Strange. Not strange. SP was systematic and methodical. They exited room 8 (keep in mind how close room 8 is to rooms 9 and 10), then proceeded in a counterclockwise fashion to check each outward-facing room. So they were always turning right out of a room and going to the next one. After going to room 10, they had completed the circuit of those outward-facing rooms. To go west in the north hallway would be to go back over covered ground and would leave unexplored the inward-facing rooms of the east hallway. So being systematic and methodical, SP started on the inward-facing rooms beginning with room 9 the storage room. After 9, SP would have gone south to the one remaining room on that hallway, room 14. Then turned right and proceeded up the south hallway to the only unexplored space that was left - the auditorium.
1) Did the camera facing south in the NE corner capture him other than coming out of Rm 10? And if not, why? See previous answer.