As my daughter would say, "Well, That's a crummy juncture", I don't think its too bad, just go the the downed part of the tree and start cutting off 6 foot at time until its lowered back down. While I've never been in that situation, dropping tree's gets you into some pretty interesting situations. Hickory tree's by far are the trickiest to drop, they hold a lot of pressure in their trunks and they have long memory's and a twist or bend that was put in them 40 years ago will show up when your cutting it down.
I was on the chain saw and had figured out where to lay it down.
I had one guy on the tractor moving logs and brush, and two safeties on the road that the tree was going to fall near.
I had hired a student as one of the safeties to watch the road and keep everyone clear of the area.
I made my final cut and stepped away to watch it fall, and this is what I saw.
The safety, standing well out of the way, looking straight up at the 60 foot dead pine as it fell, while the man on the tractor (with ear protection) backed directly into the path of the fall, both of them oblivious to the fact that they were just warned that the tree was about to fall.
I ran screaming toward the tractor telling him to pull forward, which he did in time for the tree to just miss him.
I think I had to be told to stop yelling at the student.
That is the closest I've ever come to killing someone, twice.