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Raven liked to be in charge, specially when it comes to his own body.
This means that things going out of his grasp or completely unexpected is something that he doesn't want to see or experience, specially when it comes to his own body.
Of course, this includes this certain situation he is in.
It was his mistake to begin with. He didn't ask what kind of serendipity the Heavenly Elk was going to give him. He just accepted it since he figured that having a God Beast indebted to him is too good to pass. Therefore, he had no one else to blame other than himself.
Thankfully, the Heavenly Elk was kind enough to make him unconscious right now. If it didn't, then he would certainly be in a lot of pain.