I wrote this as a "missing scene". This is from Astrid's point of view leading up to the scene where Astrid discovers Toothless. I wrote this mainly as a way of exploring the idea that Astrid wasn't jealous of Hiccup. I hope you enjoy. Please let me know what you think and let me know if you agree with my take on it. Especially let me know if you have a different view. Thank you.
As Astrid walked back home from dragon training, she thought about what had happened. Somehow, Hiccup seemed to be able to defeat any dragon. But she knew, she could tell. He wasn't really defeating them. He was using some sort of tricks to defeat them. Sure it worked fine in the ring, for now. But how about when the dragons attacked the village and there were up to a hundred at a time? She keep trying to prove to the village, the other kids, and maybe even Hiccup himself, that the viking methods they had always used were the best. But he managed to beat her every time. And now look. He would go into the ring to kill a Monstrous Nightmare. He never killed the dragons, that's how she knew there was a trick involved. He would not be able to use his tricks tomorrow. He would get someone killed, maybe even himself.
She shook her head. Why did she care if he got himself killed? It would be his own fault, not hers. But she did care. Hey, getting the living daylights scared out of him would be a good lesson that he couldn't fight dragons the way he did in the ring.
She stopped walking. She could see her house, but she could also see Hiccup's house. She stood for a minute, fighting inside about what to do. It doesn't matter, she hissed at herself, but she started to walk up the hill towards Hiccup's house. She groaned inside, she didn't know how to go about this. She was almost to the door, when she thought maybe he had gone off into the forest again. She hurried into the woods and went back to where she had been when she saw him the other day. She began to look around, and found a very light trail on the ground. She followed it a ways, and found a large trench dug into the ground near a tree that appeared to have been split in half. She followed the trench and arrived at a hole in a large rock wall. She peered through and saw a large cove inside with a lake, but no Hiccup. She heard a noise in the woods behind her, and hurried done to the bottom of the cove. She slipped behind one of the larger boulders and waited. She heard someone talking. Was it Hiccup? It was. She saw him enter the cove with a large basket. She peered around the rock, trying to get a better look. What in the world was he wearing? And who was he talking to? She gripped her ax; it was time to get some answers.