Cain was surprised by what he heard so he turned toward William, "Can you explain why?"
It was very simple, he wanted Cain to stay in the city. People with great talent are usually on the move, chasing their fate!
Finding a solution to his daughter's condition in a single day, that fighting power! William remembered how the mansion was shaking just from Cain casting his spell on Alice.
Giving him the position of a knight and a house will help keep him tied and ready for use all the time! That should have been a clever play if the other person didn't realize what was going on!
Not realizing was both bad and good! Bad meant the person was easily manipulated and deceived, greed might be their guiding motive! And a good thing since they can be used easily!
Of course, there was a more straightforward method than this, Marriage! William hated the idea of having to give his daughter up to the point he was ready to sacrifice a whole house!