EE and co-worker were on a screw about 25' off ground. Co-worker felt the screw shake and looked up to see EE wedged between conduit and railing. EE was reaching out to him with his right arm, co-worker took his arm and tried pulling him up. EE began shaking and passed out. Co-worker lost his grip on EE. EE fell about 5 feet. Co-worker got help and got EE to the ground.