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While I could be mis-remembering this, the Rat doesn't actually have anything to do with Imp Kang per se. It is there so that he can target area-of-effect spells at players with bouncy effects or spell immunities. The rat is programmed to stand next to you and he casts the spell at the rat. This simulates the ability that you have as a player to cast a spell like cloudkill on "empty ground", a power that scripted enemies do not generally have.
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