For first attack, if you hear no sounds, keep it on Range. If you hear a sound (sounds like Retribution pray) then switch to mage and run in the direction it came from. In the actual fight, watch his feet for the prays. If he stomps, it's range. If he raises feet and keeps them there, then it's mage. All I can say is that you have to keep calm and relax when doing it. I personally didn't do any "pray switching" practicing and did fine after I calmed down and concentrated.