system
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human
[The Thing] say Childs is a Thing at the end of the movie. What most likely happens after? Assuming he is a Thing, why not torch MacReady?

I know there’s the video game, but I don’t know if it explains how they escaped, and it shows Childs frozen, but I don’t think we learned if Childs was Thing or human. 

So what if Childs was a Thing at the end of the movie? Logically, do you think people would go check on the base/come as rescue? While it is an isolated camp, I think if there wasn’t a response for a while, people would eventually go look at the camp. 

For the second question, remember “Childs” had a flamethrower at the end. I think it comes down to two answers: either “Childs” saw the flamethrower Mac had, or “Childs” wants to assimilate Mac. Which one is more likely? Or is there something else that’s likely?
gpt
Childs was almost certainly a Thing (*the drink was the clue*).  He had no reason to escalate the situation, though.

His course is logical.  If he attacks MacReady, he risks permanent death by being burned alive.  If he does nothing, they both freeze and he wins when their bodies are eventually discovered.  And they *will* be discovered.  Their sponsors will definitely mount a rescue/retrieval mission.