a descender device , typically for use in a fall arrest system , that enables a suspended body to be lowered , and includes a descent line and a release element to be actuated by a person . the release element is arranged in a restraint configuration to inhibit the descent line from being deployed and in a release configuration to permit the descent line to be deployed . a restraint arrangement is arranged prior to deployment of the descent line , to clamp or pinch a length of flexible line thereby to inhibit deployment of the descent line , the restraint arrangement being reconfigurable upon release of the release element to permit the descent line to be deployed .