This fight is not too hard, but definitely not as easy as SP+UA. Your Priest should usually have the fear ward. You're going to want to really lock the Warlock down in CC, and kill his Priest as quickly as possible. You should be able to get a Sap off, but again, a Priest running away on his mount is BAD. We've actually lost quite a few games to this set up simply because the Priest was able to run away from me. So open on the Priest, pop AR/BF, and be very careful with the lock. Be ready to preemptively CoS a fear. You'll want to Silence, Fear, and Blind the Warlock. This fight can get a little frantic with all the CC the lock can put out... but just don't let the priest cast a heal, and you should be fine. Your priest, again, may need to pop out to heal before the enemy priest dies. Remember, dispels are very important!