Evil twin   change

It attacks very fast. 
It dies in 1 or 2 hits and doesn't change your karma. 
There is a limit of one per room and I actually think that's the best way to limit it. Sort of like earthquake. If another team wants to get a twin up all they have to do is kill the current twin and take over. 

I tested it a lot now and I think this is the sweet spot. It takes awhile for it to kill a built player and that player can easily turn around and mange it, but I feel as if it's a neat little distraction that adds a bit of damage. The proc rate can be nutty because of how fast it attacks but because it's hitting you with your weapon I feel like that's on you.