With my Glock 19 I can hit an eye socket at 5 yds, it was less than that.
I would have taken the same shot, I have the skill, the robber showed threat.
You can not give the advantage to an armed robber in this instance, front sight, press, you have to take the initiative, no choice.
In my case to protect my Wife, and I. We would have waited for a booth. We always do.
The good news, we would never have gone in to a Smoking allowed Waffle House!