Hand motions are the same as with classic belay systems: both hands on the rope. A fall is stopped by gripping the brake side of the rope with your hand
Assisted braking: during fall arrest, the belayer holds the brake side of the rope, the cam pivots and pinches the rope, increasing the braking action until the rope stops sliding
The GRIGRI 2’s design allows for excellent descent control. One hand holds the rope and the other uses the handle to unlock the cam. The patented handle design allows a very gradual release of the rope. Combined with the strong braking action of the cam, it gives a great feeling of security when lowering a partner or rappelling