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But it IS rated R.

. Regarding Hallaway's fate, yes David is the one who did it, but did he know the consequences? Did he know how he would react to the substance? He's a computer so we can assume everything has some sort of scientific, testing purpose to him since he lacks any sort of human emotion. So maybe that's why he asked her if she had sex with him, maybe he was just curious about the cause and effect. His agenda was Weyland's and his pursuit of immortality so to speak ("big things have small beginnings"), I'm not sure he knew the substance would kill Hallaway. It was just a test before giving it to Weyland. Since he's a robot that doesn't make him a "bad guy" either. And in the end, they are both the only "survivors" so it's not like she has a choice. She was sure she was gonna die until he tells her about the other ships. Her quest for the truth is too strong she knows he's her last hope given the circumstances to 1/stay alive and 2/find the truth so it does make sense 







