Shipyard crane collapse - GIF

Shipyard crane collapse.

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Previously:

https://www.homemadetools.net/forum/...209#post115950
https://www.homemadetools.net/forum/...986#post120127
https://www.homemadetools.net/forum/...929#post124830
https://www.homemadetools.net/forum/...974#post125094
https://www.homemadetools.net/forum/...794#post129103
https://www.homemadetools.net/forum/...413#post135419

Someone's butt is in a sling.

Timberrrrr...!

So,

A) What caused that to happen?

B) How did it just happen to be that someone was right there filming at exactly the right moment?