Francis is, in fact, in the main bunkroom, playing with something. It's hard to see what it is until he tosses it across the room- a knotted rope of some kind that seems to stick under the chin just out of sight when he picks it up. A moment after, though, he responds to Ecto's quiet whistle and takka-takka-takkas into the hallway, then down the stairs- which means Bob gets a view of both Ecto and himself from the dog's POV.