Drop Ice Crystal at its furthest range, hit it with Disintegrate. If the enemy jumps on you, Teleport away (leaving a clone behind while you reposition with invisibility). Should be able to go through a full rotation of Disintegrate and then Ray of Frost before your Ice Crystal expires. Teleport is also excellent for chasing down enemies that are trying to disengage and heal. I get MVP more often than not in the battleground, but this is also the build I'm running in H2.