The injured employee was standing on a form/bed where concrete is poured and was removing concrete from the form(s). Another employee indicated through hand signals to the injured employee that the chocks had not been removed from the strands. The employee jumped down from the bed to ground level. The bed then started moving toward him. He went to jump over the drive wheel to get out of the way of the bed, but his foot got caught in the drive wheel. The employee sustained a severe laceration and crush injuries to the foot that required surgery.