In the distance they see a fire, that could be a lighthouse and hear some singing. (no lighthouse at the period in the Isle of Man, but they don’t know that) so they approach carefully and hit a rock sinking the ship.

The lighthouse was in fact a trap.

As their crew starts to swim and climb on a nearby rock, he is killed by mermaids with red hats who were waiting for them there with tridents (actually those are witches part of the coven disguised as mermaids)

===Before the Trial===