Ansgar knew that Runa was hiding in the Reinhard manor. He had a plan, and for his plan to succeed, he couldn't lose control of his anger. He took a deep breath and stared out of the window.
Isn't this a nice day to destroy someone's house?
Death would be too good for his half-sister, Ansgar shouldn't be too kind. She had to continue living and suffer from the pain of losing someone. She had the guts to mess with Ansgar's head and heart. She must have laughed gleefully when she sent those deceptive letters.
Now it was Runa's time to bear the consequences. This was the sweetest part of revenge for Ansgar, watching the person who slighted him slowly crumbling down.