Stealing the Network: How to Own a Shadow: The Chase for Knuth

Derek stood motionless, as if in shock.
"Wait!" he shouted, almost too loudly.
"They're He's but ". his voice trailed down to nothing as he stared on in disbelief. They were letting Knuth go! Not knowing what else to do, he stood there in the LAX, just outside of the international security checkpoint, watching as Knuth collected his boarding pass and ID from the TSA agent and walked on into the terminal.
All his time had been wasted. Agent Summers had let him go. The TSA had let him go. He was exhausted and demoralized. It had all been for nothing.
His cell phone rang. Still staring at the security gate, he flipped it open, answering the call without speaking.
"Where are you?" asked the voice on the other end. Derek was too tired to speak. "Look, I don't know where you are, but get away from this guy!" Anthony's voice sounded worried. "Get away from Knuth. Now! Seriously. Just do it," Anthony said again, sounding more frantic.
"They let him go," Derek said stoically, surprised to hear his own voice.
"You are on him still!" Anthony yawped. "Listen to me. This guy is out of your league!"
By this time, Gayle had seen enough. And with Knuth gone, she knew there was nothing else she could do. She approached Derek. It was time.
She moved to him slowly, but steadily. She knew Derek would be more likely to spot her if she actually looked like she was trying to sneak up...