Well, one thing Sirius could say for his hallucination-- it got Remus's personality down. Unless that was some coded message about how Remus secretly couldn't stand him and--

Bigger picture.

Then the noise came. He was still grasping his wand so he didn't clap his hands over his head but he did cringe.

"Right." Sirius said loudly, hoping his voice would carry over the sound. "Not the enemy. I'm still shutting him up." Or was the phrase shutting him down? Though really, either could apply at the moment.

He pointed his wand at the robot. "Locomotor mortis." He had no idea how well that would work on something mechanical but the principle should be the same: make it impossible for the robot to move.