Injured was in the process of spotting a bolt in #4 Entry of 13 East, 5 rows outby the face. EE drilled a hole, let EE's head down and EE's steel was out of alignment. EE took EE's right hand and pushed EE's steel towards the drill chuck. The injured thought it was in the chuck, turned loose of the steel it kicked out and struck EE in the on the right thumb causing fracture.