[The cold air from the doorway catches Ritsu by surprise, although he tries not to shiver too much. Wasn't it - no, it was warmer a little while ago, he's certain. Well, if nothing else, it makes Shiro's point for him.

...His brother would like the snow. He shoves that thought away, along with the weight in his stomach it reminds him of all of a sudden. The wall closest to him might look a little blurred and discoloured for a moment until he does.]

In that case, you can't exactly call what either of us knows from back home "experience". But sure, I've seen spirits before.