The arena is ridiculous and his outfit is ridiculous and Damian Wayne hates everything (but that part's nothing new). The whole Cornucopia thing is suspicious to him so he's content to let everyone make a mess of themselves. He didn't need anything they had to offer him anyway.

It isn't until the Tributes start dropping that he becomes concerned, and that's when he turns back, deciding not to leave the area after all. He didn't recognize anyone in these ridiculous outfits, but he doubted these corpses would be here forever. He decides to try and examine a few before they disappear.

It's not long before things start to make sense and he's pissed. He grumpily makes his way out of here to start familiarizing himself with his surroundings.