Playing With Fire.

The only thing ruining this moment is the constantly spying demon lord.

He grew irritated and extended his spirit into his surroundings. His soul ripped control of the momentum of the surroundings from her. Then he cloaked himself in it. He finally has peace and quiet.

He sighed contently. "That's better."

Then he noticed that another thread of chaos was flowing into the flame on his crown. His act of usurping the control of the demon lord is against the order of the abyss so it created chaos to empower him. The result encouraged him, so he actively pulled on the momentum with the Chaos energy around him and fed it into his flame. The flame ate it up and began to grow faster.

He chuckled. "Even better."

Her control of momentum isn't as absolute as her control of the energy well. She is sitting right in the energy well, so he will have to move there to get it from her. Even then, he won't succeed unless he kills her or she gives it up.