must follow commands

"Or was compelled to," Bob said. "Um. Harry, can I come out? Just inside the lab? You know, while we talk."
I blinked a couple of times. Bob was full of mischief on the best of days. I didn't let him out except on specific intelligence-gathering missions anymore. And while he often pestered me to let him out on one of his perverted minirampages, he had never asked permission to leave his skull for the duration of a chat. "Sure," I told him. "Stay inside the lab and be back in the skull at the end of this conversation."
"Right," Bob said. A small cloud of glowing motes of light the size of campfire sparks came sailing out of the skull's eyes and darted to the far corner of the lab. "So anyway, when are we going to work on the new blasting rod?"
"Bob," I said. "We're talking about The Word of Kemmler."
The lights shot restlessly over to the other side of the lab, swirling through the steps on my stair ladder in a glowing helix. "You're talking about The Word of Kemmler," Bob said. The glowing cloud stretched, motes now spiraling up and down the stairs simultaneously. "I'm working on my Vegas act. Lookit, I'm DNA."
"Would you stop goofing around? Can you remember anything at all about Kemmler?"
Bob's voice quavered, the motes becoming a vague cloud again. "I can."
"Then tell me what you know."
"Is that a command?"
I blinked. "Do I have to make it one?"
"You don't want to command me to remember, Harry."
"If it hurts," I said, "I'll stop, and you can forget it again when we're done talking."
"But- " Bob said.
"It's a command, Bob. Tell me."
Bob shuddered.
It was a bizarre sight. The cloud of lights shivered for a second, as if in a trembling breath of wind, and then abruptly just shifted, flickering to one side as quickly as if I had been looking at it with one eye closed and suddenly switched to the other.
"Kemmler," Bob said. "Right." The lights came to rest on the other end of the table in the shape of a perfect sphere. "What do you want to know, wizard?"
I watched the lights warily, but nothing seemed all that wrong. Other than the fact that Bob was suddenly calm. And geometric. "Tell me what The Word of Kemmler is."
The lights pulsed scarlet. "Knowledge. Truth. Power."


Dead Beat Chapter 3, Page 26-28