Motor drives don't always ensure victory. Thinking I'm going to get a sharp point-of-impact picture of a golfer driving a ball I set The Canon Pellix at 1/1000 second and 9 frames a second. The result taught me that the moment of impact always happens during the 991/1000 fraction of a second that is NOT recorded on film. And switching the thing off is a good idea before putting it in the camera bag. If it's accidentally triggered that 36exp roll of Ektachrome will zip through in 4 seconds and you can't fumble fast enough to shut it off.