Maybe a little of both. Mochi's in good health though, so that's gotta count for something.

[He might already be inching a hand for one of the pieces of candy even when Jack settles on his desk. He leans back in his chair, apparently not bothered by the fact that he has a new desk ornament in the form of a winter spirit.]

The whole "seems to move slow and fast at the same time" thing? Because I can see that. [He shakes his head.] What do you think I'm researching? A lot of my friends got sick but I'm still okay. I haven't figured out how yet. If you're a winter spirit, does that mean you're immune to stuff like colds and flus?

[Unless Jack's sick and hiding it really well, but it doesn't look that way.]