A/N: This is my first story, so please don't criticise. The brief for this story is that Hiccup, in an accident during HTTYD 2, lost his other leg. We start when Toothless breaks him and Hiccup out of the ice block. On with the story.
No one POV
"No!" sobbed Valka, leaning against the block of ice. She'd only recently rediscovered her son and husband, but Stoick, her husband had already died, shot by Toothless when under the control of the Bewilderbeast. She couldn't lose her son as well! Slowly, the ice started to glow a blueish whitish colour. Startled, she pulled back. Suddenly, the ice shattered, revealing a Toothless with a blue glow along his spine and along the roof of his mouth, curled around an intact Hiccup. Leaping up, the Night Fury bounded along an outcropping, again roaring up at the Alpha, who roared back. Back on the ground, Hiccup is talking to his mother, and says, "He's challenging the Alpha!" He runs along the outcropping after him, stumbling a bit on his right, whole foot and hops on his dragon. Gradually, the dragons who were flocking behind the Bewilderbeast flew behind Toothless instead. Hiccup shouted up at Drago, "This is what leading the dragons looks like." Toothless fired a single plasma blast at the massive ice-breather, and then another shot hits it, a fireball from a Rumblehorn. This triggers all the others to launch an attack on the dragon giant. Drago ducks behind a spine, but as he peeks out, a dragon blast knocks his fake arm off. When the barrage finally stops, Toothless fires several blasts, each one knocking the Bewilderbeast's head to the side and producing a cloud of smoke. Out of the bottom of the last cloud, emerged a white object, that turned out to be the now defeated Alpha's left horn. The Bewilderbeast, robbed of his Alpha title, turned to leave, with one last baleful glare at the previously pitch black, now glowing blue, Night Fury.
As Hiccup climbed out of the saddle, he stumbled when his right foot came into contact with the ground. Sitting back on Toothless, his friends, mum and girlfriend came running over.
"Are you alright?"
"I saw you stumble. What's wrong?" That would be his mum, over-caring as always.
"That was so cool! The way Toothless lit up, the way the horn came off, the mass attack!" That would be the twins, destruction-obsessed as always.
"I'm fine," the one-legged Viking protested.
Time skip to just after the chiefhood ceremony.
Hiccup braved himself, ignored the worry about the numbness in his right foot, stood up from his kneel… and fell over.
The last thing he heard was Astrid shouting, "Hiccup!"
Then blackness.