[Baymax is busy standing guard and also scanning the area for any other signs of life by the time the Hamadas and Hiccup approach the door. Unlike Toothless he isn't outwardly showing his protective side but he's most certainly gearing up for whatever may be on the other side of the door. He senses his partner's sudden spike of anxiety at the idea of Tadashi going first, but before he can comment on it Hiro rolls his eyes at Hiccup.]

You and I weren't here too long ago, Hiccup. We kinda know what to expect. [But he looks up at Tadashi anyway.] Let's just open the door and see what's out there before we figure out who's going where first. [And before either of the others can stop him he grips the doorknob again and almost forcefully turns it...only to find it even more suspiciously unlocked and allowing it to swing open for the three of them to peer inside.]