The Baumann has a ring at the head through which the tag line must pass, before being secured to the upper carabiner. Failure to route via this ring renders positioning control all but impossible. I have watched the video a few times and it looks like the tag line bypasses this ring and is attached directly to the upper biner, allowing the Baumann to spin.
We don't employ a weak link. The tag line end is secured to the bag from which it is fed, and the bag weighted with a suitable rock so that the entire line can be flown, in the event of hoist failure, without fear of snagging the tail rotor.
Pilot positions back and left after lift, until he can see the tag line operator. This provides a good hover reference for the pilot, takes a workload off the hoist operator, and provides the tag line operator a good angle with which to control the stretcher. The patient's head is always forward. The distance one can move back and left is determined by the hover height, obstacle clearance and length of the tag line.
It is not possible to enter the stretcher directly to the cabin in the 109/119, one is required to seek safe landing area to repackage the patient to inside due further transportation.
One other observation - landing with the stretcher on the hook could shock load the hoist. We hoist out again from a low hover to ground handlers at the staging area.
Many basic errors here, but looks to me like the error chain started with the stretcher rigging.