Der Eisen Easter egg help

For the Der Eisendrache Easter egg, the number of players determines how many upgraded bows you need, as long as you don’t start another bow quest, right? During the step where you follow the ghost and get kills, it suddenly stopped feeding souls for some reason. I was really confused at first, but then my duo said he touched one of the paintings for the Wolf Bow. It didn’t say he started the quest, but is that why we weren’t progressing?