the adrenaline's coming, like, oh, my god, these guys actually came back to the house. >> reporter: kaarmawife stayed back, while he went out the front door and turned toward the garage. >> a few quick steps around my front. and you saw where my truck was parked, pretty much with my butt touching my grill guard. that's where i stood. and then she flipped on the light. >> reporter: kaarma told the detectives he was blinded by the sudden light and realized the only one way for the intruder to get away was to go past him. then -- >> i heard something move, like, a piece of metal hit the cement. either that or a piece of metal hit a piece of metal. it sounded like either a metal wrench being picked up or maybe the axes. >> reporter: so markus kaarma says he did the only thing he could to protect himself. >> immediately i fired high up into the right corner of the garage. here i am looking at my garage. i think in total four rounds were shot. all directly, one, two, three, four. >> if i live in montana, what right do i have to shoot someone who has entered my house? >> you have the right to use