You bolt towards the shore as the horn, the sickness and the intensive cardio starts to slow you a bit. The serpent is on your tail!
The group of you dash, Varg goes into wolf form on the fly and darts back, runs under Martijn and has the weakened rogue mount him, he (?) just gets grazed by the serpent's fangs for (23) damage, and he falters a bit but darts ahead faster than all of you. Martijn holds on for his dear life and he leaps as he gets to the shore, hopping off the 10' cliff face and lands next to the boat before he yelps in pain as he changes back. He screams in human form too and grabs his leg. It's not broken, but you can tell he landed on it funny. He grabs you and hucks you onto the boat who's just getting to shore, and you land deftly onto your feet.
The others bolt out of the wood, the ship now ashore and Varg on the boat, pulling the others on board as they come with the crew, and a loud overpowering hiss is heard as Ouroboros slams into a tree, knocking it over and giving a loud CRASH. He then hisses more aggressively, and the crew kicks he boat off and rows like the wind away from the shore. The serpent slithers down and chomps at the ship, but it's already out too far. Ouroboros hisses again in fury before turning back to his wood. The marks in the sand are deep and wide, and after a good minute or two of catching your breath, you realized you escaped the danger.
Varg gets up and pukes over he side of the ship, the wound given to him by the serpent is present on his leg. Its red and throbbing, and the rest of his leg is swollen. Martijn notices this is he leg that he landed on.