On an unrelated note, I was running Praetorium last night with a guy taking a while to watch the cutscenes. Anyway, while we were waiting for him we were sitting in the room where you fight Nero. I heard the chime of a LB bar filling up even though we weren't in combat, and I noticed that the LB bar was filling itself up rather slowly over time. Don't know if this happens in other areas or not or if this was a bug specific to this encounter.