District Overdrive [1]

'Our faces might be different, but our signatures were still noticeable. Even if I wanted to conceal the signature of my magical power, I couldn't because I didn't understand how their detectors worked. They were just existing, and from the memories of the guards, they didn't know how it really operated.'

Roger had seen from the guards' memories of the detectors being dispatched to their guard post without being taught how to use them. They said that it would automatically activate, and alarm the headquarters of the people registered for it.

"Who are you, people?" Roger asked.