I think The Purge only ends 1 of 2 ways for our 3some. Either Jenna dies and Rick and Lila have to deal, or Rick and Lila die and Jenna’s left alone. On the flip side, I could see just Lila dying as methinks she had all this planned (party shooting + we happens in 1×08-1×11) to get Jenna to herself so that they can go save the world on her dad’s money without Rick. Dad and Mom dead = lots of money. Get into R&Js house to get Rick killed = Jenna to herself.