Armin was in his room, the door shut. You could feel the heat from the door- the room must be burning hot.. just how was he okay in there?

"I'm not coming out... the cold of this world will kill me... winter is never ending-!" He whined from inside, he seemed to be out of his head...

Just what on Earth do you plan to do to get him out? It doesn't seem that he's coming out willingly.