Definitely an excellent question, but wrangling a gun and possibly a flashlight, if needed, at once is tricky enough. Running a recorder would only distract me from either fighting or taking flight.Anyone ever consider how to document use of force?
One could get caught flatfooted and be forced to give up their wallet. However, later on in your scenario, one draws and fires. I daresay that upon facing two men with knives, I would have already drawn and been up on target. OK though, I will grant you that it's possible the scenario could unfold with them too close to draw, but as they move away and decide to "take care of business" it is only then that I'm able to draw.The stairwell door swings open and 2 "thug" type males step out both wielding knives.
Upon reaching for the knife, I can't help but think such likely sudden actions would be perceived as furtive action or some sort of pre-attack indicator that leads me to shoot BG#2.The accomplice picks up his friends knife and runs away.