You don't move your arm.

Your arm doesn't exist.

You're just a hand and a brain--thinking! And that thought sends a bullet at the mark!" He leaped back.

"Draw!" There was a wink of light at the hip of Bull Hunter, and the gun roared.
Instantly he cried out, alarmed, confused, ashamed.
"I didn't mean to shoot, Pete.

I'm a fool! I didn't mean to! It--I sort of couldn't help it.