Feb. 21/14-The Remote Helicopters Ltd. Airbus Helicopters AS350-B2, C-GRHL, was conducting a training flight at the Slave Lake, AB airport (CYZH). During a hydraulics off landing exercise, control of the helicopter was lost and the helicopter collided with the ground resulting in substantial damage. The two flight crew sustained minor injuries. The engine continued to run after the impact; however, there was no post impact fire.