The Witchblade's magic interfered with his very thoughts. Every action he thought to make was instantaneously checked against the Witch's orders. Yllicus paced the room, frantic now. Every possible plan was disallowed by the Witch's cunning words. She had thought of everything... Or had she? 
He still had Seer. Not only had she allowed him to keep it, but she had given no orders regarding it whatsoever. It wasn't possible that she didn't know about it. Her spy had told her everything. Could it be a lapse in her judgment? Or perhaps she didn't care for it. Maybe she saw its weaknesses more clearly than he had. 
How could he use this to his advantage? No matter what Seer let him see, his actions were limited by the curse. 
He took the sword from its scabbard, and gazed into the future. At the current course, he saw his own success in the task that the Witch had given him. He could tell no one, to weaken the prophecy. He needed to change events, something needed to happen or all was lost. But the only avenue that was free, was his use of Seer. 

Or, the thought struck him, his disuse of Seer. He looked into the blade yet again, closer this time. Very close indeed. He saw [i]Mountaintaker[/i] soaring through the air. The airshipmen were hard at work, concentrating on their own tasks. But outside, a smaller ship flew. He saw it, and he watched a possibility unfold. It wasn't much of an option, but it was a change to the game.

Yllicus did three things, then. He sheathed Seer. Walked out onto the deck. And then dropped the sword off the edge.