I.E. and partner were bolting the last row at the face. While setting the ATRS the deflector pads knocked a rock loose. The rock hit the canopy and crumbled. A piece of rock hit the I.E. in the left side of the neck. This caused a laceration that required stitches. I.E. has continued to work. The size of the rock is unknown as it went into pieces after hitting the canopy.