After finding Faustus in the sewers and even completing the spider antidote quest, it still says I haven't found him and still have option to ask Silas where he's at.

I have had a couple of times where the guards will go on alert and even after breaking Los and hiding, alarm/alert does not clear. Had to reload first time losing several hours of progress as no one would talk to me. Second time I found that by going back to original guard that drew agro, if I hit h...