Kace didn't know that Hope knew what he had done to end up being cursed for not having a mate for his entire eternity, though that curse had been lifted and here Hope was so perfect in his eyes.
Hope didn't have any proof to prove if her theory was right, but from their conversation and the way Kace fidgeted every time Chiron was talking about the past and the war between the two kinds, Hope somehow knew most of her point was right.
The Donovans had killed many creatures' mates, including the centaurs', to expand their territory and one of it was Chiron's mate.
The centaur moved from that realm and came here, guarding the priestess and this land, making this place their new home.
That was why, Kace asked; why they were here when this was not their place.
And now, Kace was afraid that Chiron and the centaurs would do the same thing to him. As if this was a karma that really came for him this time.