Arthur didn't want to sacrifice the current originals for that. He knew he would have more curtains once he raided more settlements.
The settlements didn't vanish with the absence of the grandmaster of the dark angel clan. But they were scattered around and he had to wait for his armies to reach them first before coming for them.
Arthur watched the hesitant faces of the small army of originals he had. Before long they all abandoned their desire and returned to logic.
They knew Arthur wouldn't hesitate to kill any of them if they dared to move. Arthur said it before, he wanted to kill them to gain more of his black fabric.
So they didn't bet their lives on their greed and decided to retreat for now.
Except for one. The one who was their acting leader.
"May I ask for the flower for myself?" The original spoke in bravery and confidence that gained Arthur's admiration.