It was the last leg of a weeks-long jury trial, and the lead attorneys in the case were headed to Dallas’ federal building for a jury charge conference, when frightened callers stopped them in their tracks.

They learned that early that morning June 17, a masked man wearing tactical gear had shot up the Earle Cabell Federal Building, which houses the U.S. District Court for the Northern District of Texas, and where their patent infringement case, CommScope Connectivity v. Dali Wireless, was being heard. No officers or people where shot, thanks to the fast response of the Federal Protective Service, which returned fire and killed the shooter.