Extend the Story - Add a Room

You got into your car, a shitty old Mitsubishi Magna, and drove to the nearest Supermarket. It was a 24/7 place so you were already having things going your way. You got out of your car, but did not lock it so you could get away fast. You also took the number plates off your car so it would be a lot harder to identify. I mean there's probably a lot of Magnas around. It's a big city after all.
You grabbed your blade from the back seat and put it on the inside coat pocket. then you grabbed a mask that looked exactly like a real face and you put it on.
The mask took you 3 months to make and every time you look at it you always say 'Good Craftsmanship.'
You finish putting on the mask and you walk into the shop. Here you walk down to the back of the shop and get ready to make your move.

Spray the security cameras