My understanding is that these guys have a very detailed understanding of the geometry at the front of this type for exactly this kind of op.
Moving before winching is complete? Normal in their patch. They are normally working at altitude and seem to be searching for translational lift at every opportunity. Have a look at some of their online videos and you'll see they are routinely winching out on approach and doing a very quick insertion as though it were a longline. Similar but in reverse during recoveries.
It's not what is normally done in some other territories but it's not the same conditions either. I've met a few of these guys and listened to their presentations about specific rescues. They present as very professional and they have a niche way of working for the conditions they encounter on their patch.