One thing that came to my mind about this is the BG was persistant - I mean he kept hitting that door and IMO was single-minded about getting in to do what else he had in mind.
This causes me to consider that these BGs, besides being basically dumb animals, have one objective in their minds, be it robbery, rape, killing, or whatever, and will not be deterred except by actions such as we see in the video.
And therefore, although I simply want to stop the threat, like we all do, I want to make sure the threat is stopped immediately. Solution: .40 minimum and 13 rd mag at least.
And I hope I have the presence of mind in a situation like that as this woman did. Good Job!