Toxicology expert William Sawyer had just begun a deposition in a case involving formaldehyde exposure when the questions started to get hostile.

The defense lawyer, Robert Redmond, a partner at McGuireWoods, “became abusive,” leaning into Sawyer’s face with “an outstretched neck” and at one point threatening to call the judge, according to an affidavit Sawyer filed last month. After about four hours, Sawyer, an expert for the plaintiff, abruptly left the Aug. 20 deposition, which took place at the Hampton Inn & Suites on Fort Myers, Florida, across the bridge from Sanibel Island, home to Sawyer’s company, Toxicology Consultants and Assessment Specialists LLC.