Uhh, guys?
I don't think this is supposed to happen...

(Spoiler alert! Stop reading if you haven't finished the regular Fallout 3.)
Anyway, besides that, I'm at the way end of fallout 3, where, if I continue now, I'll end the game.
Mainly because I don't have any sort of DLC yet, except for my own creations with the G.E.C.K.
But at the way end, after you go into the purifier and Lyons gets told that someone needs to turn the purifier on, I had to use the console to warp myself back to Megaton to keep playing the game. And sometimes, out in the middle of nowhere, I see Lyons running for me, and if she catches up to me, she'll say "Someone needs to go in there and turn on the purifier blah blah".
I wish that I could find Broken Steel in a store :(