Hmm, makes sense I suppose. You know a more effective way would be not to kill them, but to instead start a process of hiding them in an enclosed underground room, say basement (cliche I know.) Take a knife (nothing fancy, just enough to cut bones) and take about 5 days to separate each and one of their limbs. On day 5, one foot, day 10, another foot. You get the point. If they complain about the fact that they're bleeding, just feed them their blood. Also, make sure not to leave the wound open for too long, or they might die. Continue until all limbs are cut except for their head and body, at this point, show mercy to them, and just cut off their head. Might sound a little too excessive but it gets the job done.