Alexis may not physically carry the battery, and thus was unaware of it, but her body was "stained" by its dark aura. It could be felt by certain individuals, primarily the other parasitic batteries.
She was leaving school at the moment, walking home.
"A comrade..." Candice watched from afar. Just having Conqueraptor's battery on her person allowed her to see that it truly was one of her comrades. The same bruise-dark aura. Candice began following her at a distance. The girl wouldn't be interesting; the Battery would be.
Candice crossed after her. She couldn't just follow this girl around all day, waiting for the Horseman to surface. There had to be a way to speed the process along, or at least allow Candice to do other things besides follow her...
"Only to meet, Brother." Candice's own eyes turned pure white. That was just a trick she'd learned a while back, to scare people. She was fully in control of Conqueraptor, but the other Horsemen inhabited whoever they could.