Hello, Oberstein is quite right in pointing out the co-existence of the "light side" and "dark side" of Reinhard when he persuates Reinhard to accept his service (Season I). They are represented (in a certain sense) by Kircheis and Oberstein respectively. If one accepts this view, then the tragic death of Kircheis does not lead to anything like personality reversal of Reinhard. I would rather call it a loss of balance. Until the return of badly injured Mueller after the "Fortress vs Fortress", Reinhard is dominated by his "dark side". During this period, Hilda, foreseeing that Reinhard would become a second Rudolf the Great if he continued in this way, vows (to herself) to fight against this trend. She succeeds in partially restoring the balance, with the help of Kircheis's ghost inside Reinhard's heart. Reinhard-Siegfried