Looking for various interpretations on how you think this appears.
At the Arcane degree, Velez allows the user to attack via his energy rather than his own body, and his actions are invisible to those who cannot see the supernatural or otherwise detect energy.
So assuming you have a character that can see the supernatural, just what exactly is he seeing? What are the various ways that you visualize it? A second ghost image of the Velez user standing next to him? A bunch of translucent arms, a la Elfen Lied?