“Two spooky looking dudes are between your and your car. They are walking towards you looking intently at you...doesn’t look good. They are 50 ft. away and at the rate of closure, your pace and theirs, you are going to meet in only 25 ft. so you have only a second or two to make a decision. What will you do?.”
I have had this happen while carrying. My response was to pretend to have forgotten something in the store and then hurry back to retrieve it. When the spookies left I walked to my car (hand on gun in pocket).
I have thought of making a 90 degree right turn, thus putting my weapon on my protected side, away from them, and then watching to see if they altered course to intercept me.
The down side of that is if they do, then eventually you have to make the second decision, which could lead to a violent confrontation.
If they really are out to get you, it is more than likely that they will jump you from behind if you turn your back on them. That would depend a lot on how far you are from the store.
Only a few feet with good lighting, they probably would drop out.
Long ways away like some of the big malls or Walmart parking lots and they probably would jump you from behind.
Where returning is not a good option, I would make the 90 degree turn, put my hand on my pistol. If they continued an aggressive intercept, draw and hold it beside my leg out of their sight but at the ready. That eliminates the likely hood of being accused of pointing if they mean no harm.
But the real test comes when they get close enough that you have to tell them to back off.
And hope they are not deaf.