Disclaimer: I do not own How To Train Your Dragon.
If you were on a boat sailing to or fro from the isle of Berk, you would see a large collection of Dragons flying to the island, but not for the reason you believe. They do not want animals or to kill anyone.
They only want the Rider.
The Rider is the human believed to be the saviour of both species. The rider of the Night Fury.
Said Night Fury flew beside the Zippleback and PurpleBack. The plan was for him to stay by the Zippleback while he searches for the Rider.
They began the attack, grabbed animals to make it appear real. Well, to make the act real. The Zippleback seperated from the Night fury as they dipped down.
Vikings began to defend their homes, the chaos carried on for around ten minutes when the Night Fury landed in the centre of the village.
In front of a Viking.
The other dragons saw this and began to circle the pair. The other vikings took notice of this and stopped.
Two Vikings were running to the Viking.
The Viking the Night Fury was facing slowly lifted a hand and they touched.
There was small spark and the Viking's eyes closed and he fell forward. Night Fury caught him and a Nightmare lifted him by his arms. The Night Fury followed behind.
The Dragons flew away with the Rider.
A yell of "HICCUP!" echoed around the island.