If IMNorth injures IMCenter, that forestalls a draw.
I think IMCenter can dismiss the summons, as the ability is like a summon monster spell. I will have to consider that next time IMCenter wants to attack IMNorth.
IMCenter is at 15N20E. IMNorth ran as fast as it could at IMCenter, but could not make it there. IMNorth does not have any ranged offensive attacks available anymore, or else it would have been compelled to use one.
Round 637: IMNorth steps to 20N20E and tries to get back at IMCenter for the ice storm. IMNorth's battle ax glances off IMCenter's armor (rolled 21). IMCenter, wanting to get back at IMNorth, steps back to 10N15E, concentrates, and IMNorth disappears.
Round 638: An ice storm hits Kaos IV, centered at 100N25E (thus forestalling the draw), inflicting 15 bludgeoning and 8 cold damage. Kaos IV has 135 HP remaining. IMCenter moves to 30N15E.
What does Kaos IV do? Remember the half movement through the ice storm in case you want to move.