RIPLEY: Ash, when Dallas and Kane are off the ship, I'm senior officer.
ASH: Oh, yes, I forgot.
RIPLEY: You also forgot the science division's basic quarantine law.
ASH: No, that I didn't forget.
RIPLEY: Oh, I see. You just broke it.
ASH: Look, what would you have done with Kane? His only chance of survival was to get him in here.
Ripley continues to make decisions that are best for the group, although this one is a rough one. What we're curious about are Dallas's motivations. Does Dallas think he is doing what is best for the group—that is, rescuing Kane? Or is he still thinking about Dallas's needs, i.e. not having a guilty conscience when this is over?