Ten former Quinn Emanuel Urquhart & Sullivan lawyers now at Selendy & Gay have challenged part of their former firm’s partnership agreement, arguing in Manhattan state court that it includes an unethical requirement for departing partners to give a cut of their legal fees back to Quinn Emanuel for any clients they took to the new firm.

The Selendy & Gay lawyers, who include founding partners Philippe Selendy and Faith Gay, along with eight others, filed a petition—dated May 11 but entered into the public court docket on Tuesday—looking to shut down an arbitration proceeding initiated by their former firm in California. The court filing marks the latest in what has been a less-than-amicable split by the Selendy & Gay team, a group of litigators who left Quinn Emanuel early this year and officially launched a new firm in February. Previously, Quinn Emanuel founder John Quinn made negative comments about the departure, specifically focusing his ire on Gay.