The same way Sister Orb noticed the extra resonance, so did Fratekla with her own Foundation Fragment. It's just that she found it hard to believe. No one would ever expect the demons to come to this continent, let alone bring a Foundation Fragment with them. How could someone else have had the same idea? "Listen up, everyone. We probably have angels here."
"What?!" Rlakux and the others were taken aback to hear that. "That's impossible! Angels would never risk coming to this place with our advantage in the temporal barrier."