Unfortunately for Dipper, while Hiccup was weak by Viking standards, he was still stronger than him. And Dipper's reaction had set off Hiccup's curiosity, which, incidentally, had the unfortunate habit of causing him to ignore his self-preservation instinct.

"Look, at least let me just see what it is before we run off. If only so I know what to look for in case it starts chasing us out of here."

Hiccup slid the door open slightly and peered past it.