^ Just saw that as well.
I'm wondering how the segment ended up in the river. Did they simply "release" it and purposely let it fall when the crane started to tile (like a quick-release coupling for emergencies)? Or did the operator "let off the brake" and let it fall pulling out cable as fast as it could?
I don't think it's that big of a deal. Sounds to me like they followed procedures and ended up with no injuries and no serious damage.
Port Mann Crane Pics