The dark green scales of the Jormung's tail break the surface of the water as its tail rises up, until it was many times higher than the boat.
"It's diving into a cave or something below us! Watch out for the tail!" Fishlegs yells from up on Meatlug.
Before the last Vikings on the ship can be lifted to safety, the tail slams down diagonally over the front of the ship, just clipping the front figurehead and breaking it off - sending it flying backwards and rocking the whole boat massively.
The rocking of the boat made it impossible for Gró to get out of the way in time, and the large wooden figurehead slams into his left lower leg, sending him crumpling over in a heap on the floor.
With Sköld and Gobber already on shore, the 3 dragon riders actively ferrying Vikings rushed into action to grab everyone else off the boat.
Meanwhile on the boat, Iðunn lifts the carved wooden log off of Gró, and picks up the small, but beefy Viking. While he holds him, he takes a look at his leg, and can see the red rosettes of blood starting to form inside his trouser leg, and along with the extra bend in his limp leg, it is clear that his lower leg is very broken.
Stormfly reaches the ship first, grabbing both Iðunn and Gró together without needing to stop. Toothless is the next to reach the deck, picking up Ivar between his front paws. Lastly Hookfang grabs Hedgelout, and the Jorgenson's are the last ones to leave their now deserted boat still floating in the centre of the bay.
Angrily, as the giant tail begins to disappear under the water, Snotlout thumps his fist on the back of Hookfang's neck, causing him to spew a fireball. Bullseye.
Just as Snotlout starts grinning as if to gloat about his aim, they notice as the Jormung's head now breaks the water the other side of the bay.
It's large reptilian eyes have vertical, thin pupils which focus right on the small flock of dragon riders. Malice seethes beneath it's dark irises as it prepares to rid itself of these little pests.
It brings its tail straight up through the boat, sending wooden shrapnel flying everywhere, and causing all the Vikings to shelter behind any rocks or dragons they could fit behind.
The dragons weren't immune to the sharp wood splinters either, and a couple got lodged between scales on most the dragons. Meatlug got one in one of her eyes, causing her to roar and fly off inland with Fishlegs still on her back.
"We need to find shelter!" Someone shouts, throwing everyone into action, heading inland.
Astrid pats Stormfly and she takes off to joins Toothless flying above the retreating Vikings, "We have to keep it occupied while everyone gets to safety."
"Good idea" Hiccup shouts back over the loud almost therapod like roar emanating from the Jormung's gaping maw.
Snotlout was currently riding Hookfang around it and laughing as he repeatedly outran it's tail slicing towards him.
Both Stormfly and Toothless simultaneously shoot a blast straight at the Jormung's head, both hitting in the same place, just below it's right eye.
More deafening roars ring around the bay, and the angered dragon rises further out of the waters, snapping it's giant mouth at them.
The beast's massive incisor teeth are slightly curved inwards and don't seem like they should even be able to fit inside it's skull. But then further along both it's jaws there are a long row of guillotine blades made from razor sharp enamel.
The much smaller, more agile Nadder and Night Fury don't have much issue in rolling out of harms way and blasting down the Jormung's back as they fly over it.
"Note to self, don't get close to those teeth!" Hiccup laughs jokingly as he whizzes past Astrid to join up with Snotlout.
The twins are busy on the island helping the rest of the Viking force get to a Cave they saw in a cliff inland, but Fishlegs is trying to calm his frightened Gronckle and make her blink to remove the splinter from her eye safely.
After managing to regain control of his dragon, Fishlegs looks down to where Snotlout flies through, blasting the Jormung's tail with fire.
From his vantage point, Fishlegs is able to notice some strange bony ridges along the side of the Jormung's body as even more of it's giant body rises out of the ocean.
The ridges along the side of the massive serpent run along the majority of the scaled hide of the beast, some areas sticking out more than others but never more than a few meters.
Fishlegs continues watching in fascination as more of the Jormung coils up above the surface - and what looks like a giant thumb-claw appears along the ridge closest to him.
His fascination quickly morphs into horror and he screams out: "It has wings! It can fly?!"
Astrid and Snotlout are nearby and hear his scream, quickly retreating their dragons back further from the titan.
Hiccup however was jetting along on the opposite side of the bay on Toothless, preparing to shoot another plasma-blast.
The other dragon riders are forced to sit back and watch as the Jormung starts to unfurl its wings from alongside itself with the sound of countless nails scraping along a gravel beach. Rows upon rows of scales unhook and grate against each other and it's black leathery wings stretch taught. This tough, dark patagium continues down along it's nearly 700ft long body towards its tail, connected along in the long trench-like groove that runs down it's side from where it stored its wings.
Hiccup, still oblivious to the danger, flies straight at the Jormung, shoots the plasma blast and as he banks away to the side, the Jormung whips the end of one of it's wings out, swatting Toothless out of the sky and sending dragon and rider crashing down into a treeline just on the opposite side of the island.
"HICCUP!" Astrid yells.