From photo it seems that hoist operation was ongoing - hoist boom extended, winch cable extended cca 2 metres. Interesting to note that crew was composed of two pilots and two firemen - so one fireman acted as hoist operator? That means he was not full time on duty with helicopter operator? Interesting combination if I am right.
Am a bit familiar with such arangements and not a big fan of it.
But reports on spinning around yaw axis also raises eyebrows. I cannot imagine worse situation than having a person on the cable with emergency situation - been there and still sends shivers down my spine.
Looking forward for initial report.
hoistop