Who was that?

So...
One day Hiccup was exploring and he saw a red-headed girl wandering around a old ruined castle.
Likewise, Merrida was exploring said old ruined castle and saw a boy fly by ON a dragon.
Both were curious about the other, but both were supposed to be home an hour ago so instead of investigating each other, they both headed home instead

Edit: I just realized how hard it is to see Merrida in the first picture. Do you see that miniscule little itsy-bitsy red dot in the middle of the bottom of the picture? Yeah, the one that could very easily be mistaken as a smudge on your computer screen?
That's her.