Go around to catch the enemy, to have his back to you, and in front of him is your team mate. With his back to you, you shoot him. You don't need to be at his back, it's enough to catching him sideways or at angle you're sure not to hit your team mate, while at the same time making the enemy exposed to your arrow. What can happen here is: he will die from your arrow(s) or he will be left open for an attack from your team mate after being pushed back by one of your arrows.