My dad was a high school shop teacher. In 30 years in the shop, he had two students end up with minor injuries and one teacher. He wasn't involved with the teacher's injury, just the aftermath.
The teacher was mixing polyester resin for a fiberglass project. He was using a metal coffee can and a mixer on a drill press. He'd already done a mix and pour, and went back for round 2. Unfortunately, pour 1 started to set up in the bottom of the can. He plunged the mixer into the now tacky pour 1 which locked the can to the mixer. Now the can was spinning slinging round 2 out of the can. He reached down with his hands to try to stop the can from spinning. He ended up with some nice gashes on his hands though they were quickly filled with polyester resin. . . My dad heard the instructor yell, blood-mixed polyester resin spraying the area, and hit the master power switch. Then minutes of watching the instructor wince as dad cleaned up the former's hands with lacquer thinner before a trip to the hospital.
The two student injuries were preventable, always bugged my dad that he wasn't able to prevent them. Life as a shop teacher with 20+ students running equipment; a good day is when everyone walks out uninjured. One student was making a shift knob for his car out of aluminum. He got to the point of tapping the hole for the shifter, but drilled it out at the major diameter. My dad said he could fix it with a Heli-coil, or make a threaded bushing, or try filling the hole with lead and re-drill/tap the hole. Student opted for the last. Unfortunately, he had some water from rinsing the knob off in the hole. The lead hit the water which turned to steam and spattered the lead on the student's hand. Fortunately, it was more like solder dripping off copper than "Palmolive, you're soaking in it".
Other one was a student was turning a long length of rod stock and had a fair amount sticking out of the headstock. Dad had a crotch support for the lathes, but the student either didn't use it or had it set way too low. The rod buckled and started to whip. The student leaned to the left toward the back of the headstock to see what was going on and got whopped in the shoulder. Lucky he didn't get whopped in the head! I ended up buying that Clausing 5418 lathe when Waverly High School in Lansing, MI shut down their shop 20 years later. One of the "accessories" that came with the lathe was a sort of spider that dad made for the back of the spindle. In this case, it was solid and was screwed to the spindle with security screws. My dad had the "magic tool" to remove the spider. And he was the only one with the tool; left the spider on the lathe so students couldn't run stock out of the headstock unless they came to him first to remove the spider.
Hey, like my dad's students and the instructor, you learned something! Glad it didn't lead to stitches or worse!
Bruce