I've only dropped a fire arm one time in 15 some odd years of carrying. I dropped my Glock 19 when I was getting into my vehicle after OC training. I had pulled it out of the holster, and before I could secure it in the vehicle, I dropped it on the blacktop parking lot. Looking back now I just think it was karma telling me to get rid of my Glock. I did, and I haven't dropped any of my M&P's.....lol
I know a guy in a vehicle tactics class that sheared his holster off while scrambling to get out on the car. He was the driver and I was riding shotgun. The drill was both out the passenger side and then around behind the car and engage the threats. When he arrived his gun and holster were between the seats, except for the loop that was still around his belt.
I took care of the shooting and he had my back with his knife.