One can genuinely and reasonably be in fear of one's own safety even if the burglar is unarmed," said Andrew D. Levy, a Baltimore defense attorney and an adjunct professor at the University of Maryland School of Law. "But nonetheless, it would be something that a good prosecutor would consider."
in the heat of the moment... can you honestly say you knew he was unarmed. Guns fit neatly in belts and concealable places along with knives and such. Theres not going back if he pulls a gun out and shoots you. Like I said shot first ask later.