'Why didn't my radar detect them?' Jack asked in his mind. He then noticed the strange device next to Spring Crown's feet. He had seen the same device before. It was the jamming device that Gridhacker once used. That device blocked his radar detection.
Jack was in unknown disguise, so they shouldn't know that he had a God-eye monocle, but Peniel mentioned that the device's proper usage was to block detection skills. Since the World Makers didn't know the two ghosts, Jack figured they used that device in case the ghosts had detection skills to detect that an ambush was waiting in the back exit.
"I can't send a message to you," Arthur said to Jack. The device also blocked players' messaging systems. "What should we do? Should we fight them?"
Arthur had no problem in a fight. But about what to do during wartime, and where to go, he mostly listened to Jack's instructions.