Titans EL_O episode

In the episode EL_O, the Titan girls (except Raven) get a message to meet at ELKO diner with some sort of electrical interference with Donna’s cell phone, Dawn’s car radio, and in the tv that Starfire was watching as well as them all watching together when Bruce left. After having watching this and thinking about it I came to a conclusion that it could possibly be Killowatt, a new Titan. From the 2006 series. But then who could could have walked in the diner to talk to the girls if this wasn’t Bruce?