[@DracoLunaris] As Stalker is leaving the bank, to investigate the curious anomaly of her drone camera's not working, Eileen sent several drones to watch over the hostages as they leave. As the hostages exit the influence of Stalker's anti-perception aura, Eileen will be able to see them on camera and single out individuals who are not the cause of the anomaly. As the anomaly begins to move, drones in coordination with each other will be able to track Stalker's movement, even if they cannot 'see' her, by sweeping their vision to a point where they malfunction, and immediately sweeping away. See below image for a rough concept of how this would work.

[img]https://i.ibb.co/Nnd0T2Ky/stalking-the-stalker.png[/img]

That being said, I feel that such a form of tracking certainly has its flaws. If Stalker entered a door or passed into a manhole, or otherwise obscured herself in some way, the anti-perception aura would suddenly vanish, and the drones would lose her. So please let me know how far you think the drones should have been able to follow Stalker.