EE was 7' above ground with safety harness on. He secured beam w/rope to forklift to bring beam down. He used cut torch to release beam from building. Untied from the building and came down ladder. Forklift held beam in position. Beam made a noise as it settled on forklift arms and EE thought beam would fall on him so he jumped off ladder 5' above ground. Result: fractured tibia.