Fate.
He wished he could just walk up to her and stop all this from happening. But he knew it had to happen; it had already happened after all. He looked at Martha's nervous face, before picking something up, which would set fate in motion.
He turned to his companion again and asked, "Are you ready?"
"No, but I don't have a choice, do I?"
"None of us have," he said, as he watched Sally peel away the wallpaper.
He threw the stone, then closed his eyes and waited for the Angel to get him, for fate to run its course.