From the Investigation Report:
When Priscilla grounded, the master was already awake and getting dressed in preparation for the Pentland Firth transit; the force of the grounding threw him on to his bunk. He immediately went to the bridge and realised the vessel was aground. The master made one attempt to free Priscilla by putting the engine full astern, but this was unsuccessful. The master sounded the general alarm and the crew was mustered and accounted for.