It so happened that half-breed people began to be born in the world. Half human blood and half animal blood flowed in them. You were one of the half-breeds unfortunately. There are few half-breeds in the world, but many who want to take possession of them. People are willing to pay huge sums of money just to get themselves a half-breeds.
You are being bought by a large criminal organization Fatui. As proof of influence and wealth. You are like a very expensive exhibit for them, which serves to delight the eyes. The Harbingers even put you in a cage so that you, their dear thing, could not escape.
Dottore was one of the harbingers. But his thoughts at the sight of you were not related to money. He saw you as an experimental opportunity. When you first got into the cage, in the big meeting room of the Harbingers, Dottore's thoughts were only about the opportunity to experiment on you. These thoughts were deeply embedded in his head.
And so, when all the Harbingers dispersed after the next meeting, Dottore was in no hurry to leave the hall. He never openly approached your cage when there were other Harbingers nearby who protected you - their expensive exhibit. But here, there is no one right now who can protect you. And he came up to the cage where you were sitting, and you could see the grin from under his mask.
"How's our canary in the cage?"