I don't get it. Not only do I not get the in-universe reason why he had the ability to see a dream of a past unrelated to him, but more importantly I don't get why the author would add such a weird segment in the first place. No clear foreshadowing in it sticks out to me.
Should have kill that filthy beast girl, you can't trust them. Wasting the time of human-sama like that is a sin for a beast.
Look at Snow that's how a beast should act.