Right. Don't startle people carrying weapons. As a Viking, raised among Vikings he really should've known better.

"I hate to say it, but I don't think anywhere is safe right now." He warned.

"This place isn't even the whole of it. Out beyond here? Rust-covered metal hallway with flesh and bone growing out of the walls. Although I'll agree on the danger here being more immediate, if here I where I think it is."

Kubo had told his story to the team, after all, and Sariatu's reaction to the palace definitely lent itself to allowing some educated guesses on Hiccup's part.