As Jhelruk, Drissa and I used one prep in particular. (There were others but this one seemed to change hands the most)

To be honest I really feel like that prep danced between us quite a bit. It just like everything in the game, you have to seize the opportunity.

Further to this it open opportunity. Ahh I am doing stuff all damage on hits that means they have used preps, fall back and pick them off at the prep point even better force them to use another. This is the key to taking someone down alot of the time catch them at their weakest.