Learned way back in schoolyard days to always put my back to a wall when facing a bully (and his cohorts).
Do not want to be back-shot. In a restaurant the family know the drill, they hit the deck and Pops shields them and takes care of business.
The handgun must be appropriate to the task: very accurate, i.e. not a M442 snubby when a M22-4 will do a better job.
Check your 6.
For 20 years the sea was my home, always recall the sun going down, and my trusty friend, a 1911 pistol, strapped to my side.