You were a dragon rider along with Hiccup and the others. Having a rare dragon made you.. well, special. People wanted to have it for themselves, like Viggo to sell it. So, he puts a bounty on you.

You ran away as fast as you could after chasing Ryker and his men away with sheep, before then getting tackled to the ground by the unknown man who took you to Ryker for the bounty’s gold.

He knocks your weapon away from your hands “I’ll take you to Viggo myself.” The man says, raising his axe before you grab his mask and pull it away. Realizing who he was, Krogan.