I'm trying to imagine how that would happen legitamitely. Can only imagine there three options off the top of my head.
1. The coat hook got hung in the trigger.
2. He tried to reach in and get the gun out of the jacket and had his finger on the trigger.
3. He fired knowingly to alert someone to the stuggle.
Is stealing jackets from occupied stalls a new thing? I have never heard of that. I would think it would be easier to sneak under the stall wall from the next stall and lift the wallet.