Sullivan & Cromwell hit back this week at a former Skadden, Arps, Slate, Meagher & Flom associate who accused the firm of double-dealing in an international arbitration matter in which a partner served as chair of the panel, saying his $13 million lawsuit offers a “tortured and illogical narrative” that’s not supported by the facts.

Andrew Delaney sued the firm in New York state court in December, contending that after an arbitration panel chaired by a Sullivan & Cromwell partner awarded $56 million to his client, a Thai company whose coal-fired power plant in Laos was later expropriated by the country’s government, the firm then represented the government of Laos to fight the award.