APL Beligum spent the day at Fairview Cove, port side to the Pier.. Ships Tend to prefer to back into the births, as they can steam straight out.
When She Departed, just after 1600, the tugs backed her out into the basin, and she then proceeded forward through the narrows, in a move similar to one you would make backing out your driveway.
Ships at piers 41/42 at Halterm will also turn on arrival, So the Bow Faces in the outbound direction.
In this case they probably wanted to touch up some paint, or do some other work on that side of the vessel.