[ Robbie nods. He doesn't mind explaining, but he doesn't want to overexplain or to be constantly wondering if he should or if it's pandering. Asking is better.

Also, they've now exceeded Robbie's 'my parents have a fireplace' understanding of fires, so he follows Hiccup's lead and looks around, trying to assess how much ventilation is 'enough'. ]

How can you tell? [ There's a roof, and walls, so Robbie considers the room at least 80% enclosed. ]

Seriously, burnt offerings? And people wondered why the gods were always pissed. I'd be pretty pissed if the only thing anyone ever gave me was charcoal dust.