All it took was a momentary flash.
You know that teeny flash when you take a picture with your phone? The Peeper, that’s what we’re calling him, would ring people’s doorbell and as people look into their peephole, he would aim the flash in the peephole.
A moment of disorientation later, as the person shake his/her head, trying to rid the stars in their eyes, it’d be too late. He/she would already be under the Peeper’s control.
Now, standing on the rooftop of the tallest building, the Peeper smiles as his followers meander the streets below. The world is his.