premise: Johan Niemann (born 26 June 1977) is best known for being the current bass player for Evergrey and co-founding the band Mind's Eye, for membership of Swedish heavy metal band Therion and as a member of the Scandinavian theatrical metal band Evil Masquerade. He is also currently live guitarist for Tiamat. He is a brother of Kristian Niemann.
hypothesis: Johan Niemann became the live guitarist for Tiamat after he stepped down as bass player for Evergrey.
reason: I said in my statement that he stepped down from Evergrey, but he's still in the band. I suppose the fact that the first part of my statement matched up is what fooled the system.