After dancing for a while, Hans had wandered into the buffet room for a drink or two. He's wandering towards the punch when he spots Anna, smiling in her general direction.

Wait what?

The reality that his fiancee is here (here!!!) in Heropa (not in Arendelle!!!) sets in like a punch to the face. Hans's expression rapidly shifts from content at the punch to confusion at seeing his fiancee to excitement at seeing his fiancee. He's got to put up appearances, after all. He needs to look happy that he's seeing her here, despite the fact that he's confused beyond belief (why is she here???).

All things considered though, it's great that she's alive. Considering that he was heading off on a rescue mission to find her when he was rudely brought here, the fact that his fiancee is alive, breathing and decidedly not ice meant a lot to Hans and his soon-to-be kingdom.

"Anna!" he yelled, waving towards her as he abandoned the punch bowl and practically ran to her side. "You're here!" Why is she here? "You're here and you're safe! Not frozen or hurt or anything like that, oh I'm so glad you're not hurt!" Yes, he was rambling. But that was what she'd want to see: Hans, her happy, charming, wonderful fiancee who was half of the whole.