EE was the roof bolter on the left side of the CM on the 1-W Section, operating in the #2 entry, 100 blk. EE just completed EE's test bolt/test hole procedures. EE turned and started walking outby to the ATRS controls when a piece of rock/coal fell striking EE on the head. EE got sick and had head/neck pain. EE didn't violate any regulations and has training and experience.