[Tamaki really doesn't want to be at the arcade, but he needs a distraction from his thoughts of Haruhi and the fact that she's no longer in the dome. Unfortunately, the fact that the arcade leans more towards the commoner side of the spectrum does the exact opposite and he only stands there staring at the machine while it makes that annoying noise that signals 'game over'.
He notices Kaworu and keeps his eyes on him for a little while, debating if he should say hello or not.]