I'm not a 100% sure, but this happened to me the first time around, and if I remember correctly this issue was supposed to be resolved a couple patches ago... I think the quest only started working properly for me after downloading the patch (even if I was able to nudge it a couple of stages forward by reloading older saves and trying certain dialogues again).

Probably best to ask the SureAI folks and/or report to the bugtracker?

Sorry if I'm not doing anything correct before posting this. I've been trying out multiple ways to fix this problem but nothing seems to work. During the quest, after teleporting with Brother Greed (BG) to near the cave where sister pride is hidden, BG just stays there and nothing happens, the quest mark stays on top of him and talk to him wont get me anything. 

Is this even fixable? I was loving the playthrough but this really bugged me off :(

[Bug] - In Our Shadows