* Returns `true` if the [Creature] can assist `friend` in combat against `enemy`, * and returns `false` otherwise. * * @param [Unit] friend : the Unit we will be assisting * @param [Unit] enemy : the Unit that we would attack if we assist `friend` * @param bool checkFaction = true : if `true`, the [Creature] must be the same faction as `friend` to assist * @return b
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