Well.... I always carry a Glock 19, it is going to be seen, for sure, the idea of only one with a gun (shown anyway) I would imagine, so the rest can collect watches, wallets, cash?
All actions would depend on the proximity of the armed person, to me, his actions, and his location.
As my Wife and I are joined at the hip, we are always together, and any threat to this attractive 70 year old, all bets are off.
From sitting, I would put a 9mm HP up his nose!