EE was using a pry bar to hold a drive belt pully from turning while another EE was attempting to replace belts on the screen. The bar slipped causing EE to catch self. In doing so, EE had a whipping action with neck. Initially thought had whiplash but had cracked vertebra in neck. EE never mentioned the injury until 12/27/21 when EE went to Dr. EE had worked up to that point.