My father had a steel construction company, and from a very young age, I learned how to use angle grinders, big pillar drills, hydraulic presses, cranes, welding equipment. Then later on, hung around people doing electronics.
Time and time again, it was emphasized to pay attention to what you are doing, work safely, do not rush. Did not manage to get myself hurt or killed in those 40 odd years, am currently to get my kids to take safety serious. Have seen plenty of of people who did get hurt, the one that I still remember is when someone wanted to do something quickly on one of our cabinets in the technical room (of an MRI machine) on friday afternoon and did not check whether or not mains (three phase, 64A) was still on. It was, and he almost stood in a puddle of water of our liquid cooling unit too, he was very lucky to come out alive. He was very shaken up, and it was a lesson he never forgot.
But yes, he grabbed something, and somebody had to kick or shove him off to save him, because his hand clenched shut.