Rob, Colin and Colleen broke in the Mustapha's house that night.
While sneaking through a living room window, Rob murmured
"When did Bryan's house became so big like this? Maybe it's from Chronivac's environment options... Anyway, it seems there are no guards or security systems. Quite a surprise..."
"Maybe he is too busy to enjoy his time with our doppelgangers"
As Colin said cynically, Colleen pointed out.
"They are not doppelgangers. They are ourselves too. Actually, we are not whole ourselves either, we are only one of pieces..."
"OK, OK, Whatever!"
Suddenly the light went on.
Mustapha was standing middle in the living room, with Chronivac in his hand!