Then the priest just comes and tells me to go away. After that I don't have much options left apart going to the warehouse through the tunnel, which pretty much ends the game the next day, except for the possibility to find out who the werewolf is, if still unknown. (Actually I just did a quick test, an if I go to the appointment with Locke, i.e. find out who he is, I cannot talk to Koln anymore, so cannot fail to convince him)
And if I go to the town hall, I see Hertz getting arrested and then Koln just shows his pictures, which in principle makes it pointless for Eva to kill/possess him.
How long after failing to convince Koln is the scene supposed to happen? Day 6, Day 7? During the epilogue?