Prometheus net word count now reduced so that can t be used as an excuse for deleting constructive contributions It was not an excuse it is an unnecessary detail Unless you have some ulterior motive for him doing it he does it because they don t have the equipment or staff to deal with a pregnancy especially an alien one The only important part is she finds out it is inside her she gets it removed Don t be bitchy in edit summaries it s tedious Given Weyland s instructions to infect somebody whether David picked Holloway because he patronised him or whether Weyland picked him is unclear at the cost of their own life to get hold of Engineer genetics an ulterior motive that they are more interested in the alien than in her and that they don t share her Ripley ish instincts that the alien just needs to be killed is a pretty clear inference Or alternatively she might just be worried that Vickers will kill her with a flamethrower when she finds out Shaw is also infected Either way I suspect other people may feel the same and indeed it s the sort of plot point which somebody whose attention has drifted or who has nipped out for a pee could miss at first viewing Being a barnstarred editor of film articles does not mean that your humble opinion of which plot point is important is correct and everybody else s isn t although I m glad to see that it s been left in And please don t leave bitchy messages on the talk pages of constructive contributors to coin a phrase it s tedious