Yes, and he breaks it from the inside, judging from the fact that the broken glass is on the outside.
Well, how else would he get it in. Paul was having trouble with the lock.
not necessarily.
the mullion was broken to the outside. If you had a hammer you could crack the pane and then claw it back to the outside to make a bigger hole
he clearly didnt go through that hole so that means a door had to open which should have triggered an alarm