My guess is someone ordered or the deck guys dropped the stbd anchor and turned the boat heading down river at 8 kts with 0.8 kt current with no power and the rudder midships and the anchor drug the bottom and turned the ship. from the videos the ship w/o power heading straight down the channel most likely would keep going straight (inertia). unless another force intervenes. anchors can do that. if the orders came from the pilot that would be an issue for the union pilots assoc. Pilots kind a work for the governments.
the close-up photos of the Dali show the port anchor was dropped. The starboard anchor is still hawsed.