I don't know if it would be legal to shoot them just because they are in your house. Perhaps in some states, but I doubt in the majority of states. I would have done the same thing as the OP, but I wouldn't have felt that it was legal to kill them. I would have felt the danger the OP felt and been ready, but I would not consider it a legal, moral, or ethical kill. Oh, and I would have had the wife call 911 before I put on my shorts!