McDunn is confused because he is trying to figure out what is in the ocean.
"...Where are you I'm still waiting here for you..."
McDunn and Johnny have a conversation about the creature talking about how it comes every years at a certain time of the year, and when the fog horn blows the creature gets confused if its another one of them.
The Fog Horn kept blowing and the creature kept getting confused because the fog horn sounded similar like the creature and the creature feels lonely.
The creature waited for about a million years for another creature to back but that other creature never came back that's why the creature is waiting by the lighthouse because he is looking waiting for the other creature to back.
McDunn and Johnny were in the tower, it was quiet, to quiet, then the monster came up very slowly and it glowing green eyes came to the tower and the tower shook with McDunn and Johnny in it, then the fog horn and the monster roared.