Kind of like a living “trap gun!” However, it is his house and he can do whatever he wants while inside; i.e. “lay low.” I would still go manslaughter. The people inside were engaging in a dangerous felony. Should we not draw a veil over what a homeowner does to those engaged in Burglary in the home? His home is his castle and one Burgles at ones peril.
So, if he'd raped and tortured them both, that would be hunky dory?