Because he'll stay in there. It'll sound like the Impostor vented away, making him trustworthy))
"Yeah, not everyone!" He slightly smiled. He was tempted to kill Red, right now, but of course, Amelia would see. He didn't want that, as she would report the body, he would get sent to space, and he wouldn't get the food.
(I feel like he would blame her if he was a normal imposter, but then again, there wouldn't be any romance. But I think I could make it work so that he could blame her and she doesn't get ejected. Your choice on what we do.)
(Ack help I'm actually starting to like this idea
Because there can be the romance. Once Amelia doesn't get ejected, she's going to know he's the killer and stay away from him, and then they'll realize that they can't be without the other)
"Sure," Amelia said with a shrug. She stood up and started unpeeling her second banana. She'd use that as an excuse not to wear her helmet. She didn't like wearing it. Why did they have to, anyway? There's oxygen in the ship.
(So once Red comes in to fix oxy, he'd have to turn off the lights after it was fixed (because I'm not sure if you can have two major sabotages going at the same time), turn off lights, lock the doors, kill red, and report it, right?)
(Sorry kind of excited)