Actually the more I think about it the more I like it. I retract my statement (my previous -1). I was trying to make a scenario proving it was bad but ended up making a scenario where it was good. If you clicked d and made the gemini move to the right (AS LONG AS HE LOOKED THE WAY YOU LOOKED) and you clicked a as soon as possible then it would be difficult to tell who the decoy was. The real person would move left and the decoy would move right so it would be hard to tell. Also this would make the gemini slightly skillful because the person would need to deploy the decoy without giving away which direction the decoy was deployed in and would need to make movements that were like the decoy (initially). HOWEVER, if the decoy doesn't face the same direction you facing when you deploy it then it will suck.
+1
+1