I'm surprised at the fact that they even allowed him NEAR a lathe with long sleeves! Where I was taught, (A family friend) and at school, we were to NOT be wearing ANY long sleeves at "shop time" or you simply sat out and didn't get to use the machines, PERIOD....Even my family friend, you had a long sleeved shirt on, you just couldn't remove the shirt and continue on, a shirt in a shop is also a protective wearing, BUT a short sleeved shirt, so bare chested, was no answer to the problem!
I just look at some of the accidents thats happened over the years and it amazes me how people "work" or have worked to make some of our OSHA laws in-force, today!