This. He flings the rag he had in his hands and flaps his arms up and down near the counter as if unsure to start grappling with the guy. But I don't see him grab anything or have anything black in either hand when he steps away from the counter. Then he moves his shirt with his left hand and reaches down to his waistband with his right hand and fumbles something out and cocks the gun down at his waist before aiming.

[Edit] Correction, it wasn't a rag he throws down, looks like a pair of disposable gloves actually.