I just do not buy it.
I am well aware that my own failings and weaknesses will be used to try to discredit the case I make, and I can only wish someone more flawless would have presented these questions, but just consider that the stones are now crying out. Look at the case, not at me, for crying out loud.
Why no struggle, they just each laid their asleep motionless while the throat of the other was being slashed, and the dog, an alert and noisy creature, did nothing?
They were bound and gagged.