Spoiler Thread: Avengers Infinity War

billinms said

I'm not sure that Thor even knew about the possibility of the snap, he had been away the whole movie.

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Gamora is the one who mentioned the snap, and Thor was there when she said it.

I'm not sure Thor aimed for his chest, vs head. I think he just went for center mass to get a kill shot. He then pushed it in to finish the job.