She closed her eyes for one second. Behind those eyelids, she was somewhere else. November 2014. Helmand Province. A burning Humvee.

The voice of her squad leader in her ear. Sergeant Williams. Three seconds to decide, then move. Whitney opened her eyes.

Tyler was still grinning at the crowd. His finger was still in her face. His two students were still pressing on her shoulders. She did the math in her head, the way she had been trained.

The taller student on her left, 6’4″, 230, grip on her bicep, weak point, planted knee. The shorter one on her right, 6’1″, 250, grip on her forearm, weak point, left elbow hyperextended. Tyler, six feet exactly, 190, standing one arm’s length in front of her.

A fighter stance, but sloppy. He thought the fight was already over. 1.4 seconds. That was her estimate.

She glanced once toward the exit signs at the back of the room. Two of them. She glanced once at the news crew tripod at the side of the stage recording. Good.

She took one deep, slow breath in, out, and then Whitney Williams made her decision. It happened in 1.4 seconds. The taller student on her left felt her shift her weight first.

He felt her bicep tense under his hand. He thought she was trying to pull away. He tightened his grip. That was his mistake.

Whitney dropped her left shoulder six inches. The student’s locked arm went with it. His balance broke forward. Whitney’s left elbow drove backward into his planted knee.

The joint folded sideways. He screamed and collapsed onto the mat. The shorter student on her right was still processing what had happened to his partner when Whitney’s right hand reached up.

She caught his wrist. She rotated. She stepped under his arm. His elbow hyperextended with a wet pop.

He went down to one knee, gasping. Both students released, both incapacitated. 0.8 seconds. Tyler was still grinning at the crowd when he heard the screams.

He turned his head. He saw both his men on the mat. His mouth opened. He never got to close it.

Whitney was already moving. She launched forward off her back leg, not at his face, not at his throat. She drove her shoulder into his sternum. Tyler went airborne.