Walter wasn't afraid of the nuclear detonation; he was afraid of the radiation. Although the radiation levels of the nuclear warhead were kept within safe limits, a layman wouldn't know how dangerous it is to stand next to a nuclear warhead.
As for if the nuclear warhead exploded, well, even if you backed off a hundred meters, you'd die, let alone just a kilometer away.
Yang Yi didn't bother to walk away, because he wouldn't be staying next to the warhead for long.
"Contact the FBI people."
Yang Yi said from the side, and Walter took out his phone. He first called Porter, and when Porter answered, he quickly said, "Sir, we've caught the prey, alive."
After a moment of waiting, Walter said deeply, "Yes, you can let them enter the scene."
After hanging up the phone, Walter said, "The FBI people should be here soon. Shall we just wait here?"
"Hmm, let's just wait. I want to see how the FBI people handle things."
