Bret Stiles is in the room of 5, Patrick is pretending to kill. Patrick realises Stiles has been missing since the video was sent.

If this excellent theory is right: http://www.whoisredjohn.com/See-a-theory-Red-John/7461

What if the leverage is pointing a shotgun at Stiles who is among the other disposable accomplices?

If Bret Stiles is father of Redjohn, maybe Patrick wants Redjohn to come and rescue him. Its a small part of a bigger plan. That's some leverage, right?