I have heard that when the Feds brought a surveillance helicopter close to their camp he immediately grabbed the girl and held a gun to her. This happened more than once so HRT was inserted some distance away and moved into the camp on foot. As soon as he was confronted he acted like he was going to hurt the girl, and he got shot.
The signal fire, SOS story is a delusion. Who knows what kind of wacky things were going through this guy's mind. He killed two people, drove 1000 miles to a wilderness area, and takes his cat.
Obviously Hannah didn't get the memo that that was supposed to be the official story.
Why would she make up this signal fire story since the official story makes her look better as a damselle in distress.