kruser I'm a junior civil engineer and ran a QC lab at a precast plant doing pre and post tensioning. In the video it looks like a hydraulic tensioner.
So this is my professional guess. It was over stressed for the cantilever. I think they came close to the ultimate strength.Then they had to destress it. When you destress you have to put more tension on it to loosen the chuck.I think the rod or one of the end plates broke. One other thing is the chucks could have failed while relieving the pressure. I have seen chucks fail. 450' of strand flying to other end of the building in a blink of a eye.We stressed 1/2" strand to 28,000 psi.
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