this ever happen to you?

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I wasin shop today, and we were redoing the front springs for a mercury sable for a customer and we were compressing the new spring on the old strut on out compressor so it could go through the strut mount, then all of the sudden the key (the lil thing that goes between the pinch bolt) gave out and the strut and spring are fully compressed. our teacher was telling us how dangerous it is and had a friend who had his whole face ripped off by the same thing. and then the spring and strut go flying down so fast and hit me and kevin (a friend in my shop) steel toe, it bent his down to his toes pinched them down in there and put a huge dent in the front of mine, and put a nice dent in 4 inches of concrete. it was so scary and happened so fast. it sounded like a a stick of dynamite going off right next to me. our teacher came running over and making sure everyone was alright... and everyone was, but it one of the mosty scary things ever.