Cairax behind all of Legion, makes him scream

He had the unmistakable sense of someone standing right behind him. Behind all of him. Every ex within his reach felt a warm prickling on their backs and shoulders, a faint pull on the eyes. All his bodies looked around and saw nothing, but the feeling remained.
“You insult the great name of my sibling with your ignorance and arrogance. Perhaps a lesson in humility is in order. If nothing else, it should relieve my boredom while I await my new vessel.”
Legion rolled his fingers up into tight fists. All of the walking dead within three blocks copied him, guided by his anger. “Oh, yeah?” he spat. “****ing coward. Come out here and give it your best shot.”
And a few moments later, every ex in Los Angeles County screamed at once.

Excerpt From Ex-Communication, pg 378
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546