Just as some people want to insist it is a tripping drug addict.
This is why I love this website. It allows everyone to share their opinions so others may or may not see a different perspective. I have followed many cases on Websleuths and I come into it having one opinion. When I read some other peoples post, I learn things I never would have even thought about. That is what makes this website different than most. Rumors are not allowed, but theories and opinions are allowed.
If you go back to the very early threads talking about the background sounds, one person who is an audio specialist described the sounds at the end. He stated it has something to do with the recording device. I am of the opinion the sounds at the end are just artifacts from the recording. I have listened intently to this recording hundreds of times and I never hear anything about a trooper nor do I hear gunshots. Doesn't mean it isn't there, I just don't hear it!
If I remember correctly, Ladessa was given a recording of the 911 call. I don't think she secretly recorded it, but I do think she released her copy with or without LE permission. Being from Texas and also the area he went missing, I feel like I understand most of his word well. There are a few I miss because they are inaudible. Was he using again? Yes according to his brother. Was he tripping? We may never know. Was there a third party? I am pretty sure I hear it, but someone else may not. Doesn't mean I am right, nor does it mean I am wrong. We may never know in Brandon's case.
I do think some day his body will be found far from the area he went missing....