Okay, we now have four possible courses of action:
- Be a good witness
- Take the shot
- Take the shot AFTER verbally distracting the BG and hopefully getting the muzzle off the clerk BEFORE the muzzle covers you.
- Try to knock the attacker off center (I assume physically?) before shooting him.
Of these, which has the better "odds" of successful outcome by any CCW carrier (including Nerdby).
Inferred by the posts; you have time and ability to draw, attain sight picture without BG's knowledge prior to any action.
My presumption is that if you have the time to do that, you also have the time to "draw" him off his target (even slightly) and assume a position which allows for not only a good shoot but a clean one.
Less risk to the clerk by involuntary action on the part of the BG, less risk of "friendly fire" to the clerk from my gun. We cannot eliminate all risk.
But, I maintain the odds for all involved are better if you draw his weapon off his target, even minutely.
It's only an opinion, but I hold on to it rather strongly... and since it is a public forum, it gives all the "Nerdbys" a more complete perspective.. than "just take the shot, you'll be in the right."