Irgendwo wird vermutlich noch einer versteckt sein.
Ansonsten mal per Konsole mit getstage den aktuellen Abschnitt abfragen und dann mit setstage den nächsten Questabschnitt starten
- SetStage <QuestID> <Quest stage number> – Moves the quest in your quest log to the indicated quest stage. Recommended command for moving past bugged sections of quests rather than forcing the entire quest to become completed. This command can only set the quest to a further stage; it cannot return you to a stage you have already completed.
- GetStage <QuestID> – Returns the quest's current stage number.
Das müsste die Quest sein:
http://fallout.wikia.com/wiki/Fire_Support
PS: Der Bug wird sogar genannt:
Sometimes after defeating all the ghouls, the Brotherhood of Steel members refuse to talk, as if there are more ghouls incoming. A suggested to fix this is to use the console command setstage 0005ddab 40.[verified]