I don't know about Melanie McGuire. I didn't follow that trial.
But, I've been saying repeatedly, why would you steal a gun to kill him with a knife?
I was all set to go with she used the gun first, no matter what the prosecutor says, and it jammed, until I heard ALV. Now, I'm totally set back and wondering if she had the gun with her because she was afraid of him. It would fit in with her not killing him immediately--that she never had any intention of killing him until things went wrong, one more time. ALV talks about the escalating level of apprehension and fear in the relationship. Scared people can become dangerous people.
IMO
ALV is a paid witness for the defense. She can only base her conclusions on what JA has told her. I do not believe anything that either one says. Go try and watch her Snow White video on YT. I couldn't watch much, but it's silly.