I think it would be an interesting mechanic to remove the identity of the speaker when affected by one of those powers. It wouldn't have a huge effect on the gameplay, but it might offer an anonymous forum of sorts (or a means to make threats!)
Alter Ego example wrote:Someone nearby says, "You think hiding in this crowd will protect you?"
Fun times.Hide in Shadows example wrote:A voice from a dark corner says, "Vampires are among us!"