This counterweight system allows the victim to be raised when lowering is impossible.
This system is possible when the rope is not attached at the bottom.
1. The rescuer installs a progress capture pulley and tensions the system with his body weight
2. He engages the counterbalance system by pulling on the victim's side of the rope
3. He installs the ASCENSION handled rope clamp and the CROLL ventral rope clamp to ascend with the victim