From The Grey House:
“The fate that awaits you is too good for your betrayal.”
He threw Keith at the far wall then followed, going around the hole. The Blitzkrieg had changed to human form and retreated to the door, giving Vincent space to move. He was on Keith in seconds. The younger vampire was still conscious. Vincent was glad. He picked the man up and swung around, holding Keith over the hole by his shirt.
“Have fun,” Vincent stated plainly. He let Keith go.