Chapter 4..

Fritz bowed to Rassendyll as a sign of respect

الخطأ فين بالظبت.. اعتقد في حرف الجر as asign of respect هتبقي As He Thought he was The Real King

your guessing is right. he bowed as he thought he was the real king.

your guessing is right. he bowed as he thought he was the real king.
I agree with you

let's say : to the pretend king / even I believe" the king" alone would be correct.