He just kinda stood there as he was 'sacrificed'. It's the slightest bit amusing to him, but his blank, bored face doesn't show it. The only reason he found this amusing... well, he was being sacrificed. To himself.

Once the people did their little ritual and stuff, he just... used his ability to get rid of them. All except for you. The most reasonable person here. You were the one saying he was who he said he was. And that they're idiots for sacrificing him to himself. So... you're the only one that survived.

"Hmm..." He stood, his arms returning to normal arms, his tentacles fading away, and he appears as a normal human.