And I think a lot of theory is from her ninja story, where she describes the gun going off but nothing coming out, when the male ninja pointed the gun at her head.
I read her letter to Travis' family last night and she goes into great detail of how the "NINJA'S" attacked... It was helpful in picturing how SHE carried out her attack.
Don't forget she probably incorporated some of TA's past experience into her "story". You can almost see the lightbulb moment during the video where he's relating his experience, after the blonde "it" sits up and stares at him as he's pointing his finger at his head.:/
https://www.youtube.com/watch?v=aagtv5Vxn2A