Okay, I can't figure out what "Brain Relay" does, or its Fallen Empires equivalent, "Invested Surrogate."

From Fallen Empires: "For your purposes—see unworldly senses and whispering malice—if someone can see your invested surrogate, it is as though they can see you."

Do you get to somehow look through the eyes of your invested surrogate? In other words, is it a two-way thing? Or when someone sees it does it just trigger your moves?

I've crushed the web looking for an answer to this but can't find anything...

Best,

Tor