While spotting major equipment CMT unit, crane is relocating a pump which is heavy, WSR observed 1 of tagline was being catch by colleague but another tagline has no one, on that time SSE operator attempt to go to catch tagline but it's under the pump. WSR immediately stop his action and point to overhead object, SSE operator then keep moving out from that hazard area. He does not aware that the tagline was under that load while lifting and confident in crane capacity. Stop his action and call him out about gravity hazard and remind him that do not enter under the load even though to try to hold tag line, all tagline muse be held since the beginning of lifting operation.