I was solo boarding the new Spanish Undead flagships; and, as has been happening recently, I was stuck killing endless waves of gray and green mobs. I decided to head back to my ship to see if I could break the cycle that way, but the Spanish Undead thought it might be more fun to have me repel their boarding boarding parties for a while:
Incidentally, I just jumped through a gap in their ship's hull, to swim back to my ship, and just jumped over my war sloop's gunwales to get back on my ship. I had to fight a few more waves, but then I got the swinging rope and was able to sail normally again.