OK, you're new here, welcome. Maybe that explains your "amazing" description, as in an assumed positive stroke. This crew is doing plenty of things that are amazing, sure, but that is not to be taken in a good way. Using a porta wrap for a descender is dangerous and silly, as there are so many great descenders out there designed for the job. The release of large branches with a crane securing them should not result in the wild swinging seen in your video. At least, an added butt tie on those branches until they are free could keep the swing and resulting shock loading of the crane from ever occuring. Don't feel bad. You are, perhaps, new to the biz. I can remember watching guys whom I thought were great in trees many, many years ago. Now, given what I've learned over the years, I wouldn't even hire those guys because of the techniques they used while aloft. You live and learn, hopefully.