Stuck with the moth priest

I've killed everything up to the point of taking down the moth priest. It says I need to talk to him but it won't let me. And Serena keeps thinking there is a threat somewhere and is twitching. I've gone back to previous saves and re-fought everything. I've closed the whole app and brought it back up. I've fought Serena, left, waited 24 hours, came back re-fought the priest and nothing. I'm at a lost here and I just want to move on in the game.