After two months of continuous research, Rein finally decided to go out of his room. That was not because he was done with his research but because Colinde would not be able to stay away from Rein for any longer. That was the reason why he decided to go out to meet with Colinde after two months of separation.
Rein wanted Colinde to grow up a little bit from her dependency on him. He had noticed that Colinde only had him in her eyes and no one else. So he wanted her to understand her own self by staying away from him for some time.
That did not mean Rein had not kept an eye on Colinde. He had used Himiko to continuously keep an eye on Colinde's situation. She was doing relatively well for the first month but from the second month her condition started to worsen. She became distracted and was always in a daze. Her mood also became bad and she was always angry.