After Hiccup found Toothless, trained him, and all that stuff. On the day he was supposed to kill the monstrous nightmare, he ran away, and nobody was able to find him. Romantic flight with Astrid didn't happen cause she never found him in the forest. Nobody really cared then he had dissapeared and neither did Stoick.Stoick soon decided then Snoutlout would be the next chief since he was the cousin of Hiccup.
They never found the dragon nest.. so the raids continued.
1-2 years later, a mysterious dragon rider started attacking the village, terrorizing more than the dragon raids who had already been going on for years. He only attacking at night or when it was dark to have an advantage with his night fury. Everybody started calling him the "Dragon Master," pretty badass title.
Years later, they found out it was Hiccup because he, by accident, revealed that.Still the same Hiccup.. so now, Stoick and Hiccup stood against each other, Toothless behind Hiccup lowly growling at Stoick but staying silent for the most part.
Stoick: "I needed a soldier. you wanted a father." Stoick was glaring daggers at Hiccup, his voice gruff and hard.
Hiccup: "Well, I guess we're both disappointed then." I Hiccup scoffed, pure hatred and anger in his eyes as he was holding back from commanding Toothless to kill his mentally abusive father.