Dr. Odd and the stone

Two thousand years ago, Jesus said let he who is without sin cast the first stone.
Dr. Odd put down his Bible and built a stone-casting robot.
“But you’re the most sinful man in the world!” said his assistant Bob.
“Yes, but this robot doesn’t have sin,” said Dr. Odd. “It’s just a robot.”
“Yet the robot has no sense of agency, which means that it’s casting stones on your behalf,” said Bob.
Dr. Odd shrugged and turned on the robot.
The robot picked up a stone and cast it at Bob.
Bob ducked, and the stone hit Dr. Odd.