Sounds like single speeding…..
I smiled at that 🙂
(the knee thing still makes me feel sick every time I think about it, I have to say).
Pulverized balls are kind of at the funny end of the wincing spectrum though. I’d love to see the teacher’s risk assessment for that lesson.
The dude who was hit is the teacher. He was just fine – it was a graze – not a full on partitioning. The person holding the axe is a member of staff (either an assistant principal or a hall monitor) that we asked to come help with the demonstration. The teacher walked funny for like a couple of days and then he was just fine. AP Physics I is fun because of stupid things like this happening.