A quarrel over a deposition that cost Alex Oh her job as head of enforcement at the U.S. Securities and Exchange Commission could cost her client or old law firm hundreds of thousands of dollars in penalties, according to new court filings.

Oh was announced as the SEC’s next director of enforcement on April 22, but just days after starting at the securities watchdog, she abruptly resigned, as reported. The move came hard on the heels of a D.C. federal court judge questioning Oh’s conduct in litigation she handled for Exxon Mobil while working as a partner at Paul, Weiss, Rifkind, Wharton & Garrison.