Given the astern speed I wonder if they lost throttle control while maneuvering to dock and it got locked in.
If crew were up in the rigging to strike and stow sails, which would be odd other than for show in confined waterways, they most certainly had a bad go of it for sure.
Regardless, that is quite a bit of highly tensioned line and heavy timber snapping and dropping onto what I assume were crowded decks. Looks like the tug Charles McAllister was there as an escort but may have not had a line on her.
Prayers for those injured.