There is something behind you in the fog. It's best to consider it another vessel, as the alternatives are alarming. The fog makes it bold. It's not far behind you now. Not far at all.
There's another ship out there. Very close. Too close. Hard to starboard! You pass close enough to shake hands, and someone on the other ship shouts hoarsely at you: 'It fell from the roof! The legs! The legs!'