Yup. Didn't do it. So I just finished my second play-through. Very-evil. Oh yes. I followed Liberty Prime to the Jefferson Memorial, close enough to keep up, but far back enough not to get shot at, which was nice, seeing as I'm no good with guns. So Sentinel Lyons and I get to the purifier control room and she tells me one of us will have to start the purifier. Not I! So I inserted the FEV into the panel, started the air cycling and sent Lyons into the room to die of radiation. Woo! I shall begin my next play-through soon. I'm going to try to finish it as quickly as possible. Little/no side quests. Suggestions for gender or names?