Despite the slight tarnish in some of the replies, I think his scenerio was wise -excluding the tossing of the car keys.
If anything I would:
Place car in reverse, move a few hundred yards down the street.
Put on hazards, start dialing 911 as I walked back towards the store.
Conceal cover behind the passenger with a bead on the inside man.
He takes a bead on her, he gets my beads.