When I read the earlier post, I thought it was a simple boring self-lowering tower crane.
I did not know they were using a derrick (a high wire act), If I would have know, I would have captured the jib removal (got home at 3pm today).
I'd like to capture the removal of that temporary steel work, I'll check up on that when I get home from work.
This evening from Anchor Point 1 roof deck
https://makeagif.com/i/8dkm1T