Lots of good comments. Bottom line: IF you were being compensated by the shop for your assisting in the class, then worker's compensation would cover. BUT it appears you were a student as well. , so probably not. Absent some person doing something or failing to do something that caused your injuries, you have no remedy. That's why I carry DAN insurance and instructor liability insurance, in addition to my legal malpractice insurance (Lawyer is my day job).
DivemasterDennis
DivemasterDennis