This is an extremely biased piece of work. It muddles an extremely complicated situation to conform to the author, and director's, narrative.
The author, Elizabeth Flock, has written about this case and made this poor piece of film. Rather than using the facts and details to tell the story, she is selective to the point of extreme bias and the utilises victimisation to try to support her point of view, such "there are no perfect victims", which there aren't, but that does not make it ok to try to frame information to shape your narrative.
Ultimately, there is no question that Brittany is a victim of abuse. That does not justify the crime she committed in this instance.
What was played down was the testimony Brittany gave, she lied and changed her story, this makes the ability to trust her account difficult. Additionally, McCallie came back to the house with a gun rather than informing the police, these are only a couple the facts totally played down by Flock.
Just read up on it, this particular case is not a "stand your ground is for white men" example and Elizabeth Flock is our looking for more of these cases now... no one ever seems to have explained let the evidence lead you to the outcome to her, she is clearly working backwards from an outcome.