And make Signal or code response in advance.
Too easy to do like i did in 2006. I came in the back of the ennemy, they ask me if i was a friend, i said Friend, rush quickly to him and mercied him.
And when he look at me with my gun pointed at his back he said Damm..
So Before the game start, find a code to be able to know if they are ennemy or not.