I guess with the stern firmly anchored, the ship wasn't drifting far :)
A definite "Oh shite" moment though!
I've been on two ships that the Captain forgot about the CPP one direction rotation:
We had a ship stop in moving ice, the Captain was told by the Ice Captain not to de-clutch.
Not going into personalities, of course the Captain immediately de-clutched.
Ship is moving with ice, directly toward an island and the bottom is shoaling.
The plant is restarted and the engines clutched in. But, there is a chunk of ice jammed into the blades (which is why the Ice Captain advised against declutching), propeller is jammed, shaft clutch starts to slip. Engineroom calls bridge.
Captain's next decision is to throw the telegraph hard astern to clear the ice out of the propeller. Smoke from slipping clutch gets thicker.
I roll down on watch about this time in the proceeding, gagging and spewing at the stench. Chief is right behind me. We put the shaft turning gear in and turn out the ice just in time to save a major embarrasement.
The other time, a ship that will remain nameless, run over a channel marker buoy and proceeded to wrap the chain around the rotating components. The Captain reacted quickly throwing the telegraph astern and suceeded in wrapping the chain and buoy thoroughly in the Kort nozzle.
Remember Martin's post about 5 year survey of main engines? I think we did 6 or 7 units while on the dock as the shafting was being done. Maybe more, it became a blur at the end, between the 12 hour days and the runs ashore. We were doing a unit a day.