"I don't get this. Why wait in the car? Was the wife still in WalMart? "
There wasn't anything overt enough to call police or even tell the wife something was wrong. It was just a subconscious feeling that they were up to something.
I went out to the car so I could arm myself in case they were hanging around outside when my wife came out. I didn't want to wait until they were already outside.
It turned out that they followed me - but far enough back that I was in my car and armed before they passed by. A few seconds later the guy they sent to circle back popped up behind my car in time to see me checking the chamber of my 1911. He ran back to where his buddies were waiting and they all took off in a different direction.