I did not see a bow thruster, I did see the anchor chain splashing in the water though. A bow thruster would not be very useful with the anchor down. And I think that the Captain just used the two props, starboard in forward and port in reverse to generate a torque and pivot around the anchor.
Clearly a seaman of great skill in any case. Heck, I'd be wetting my pants if I was coming into port on a ship that size at those speeds.