In any case, that evening, at 11:28 p.m., security cameras captured Afshin Pishevar walking with grim purpose toward BamBrogan’s desk, one hand clutching what looked like a rope. The next morning, BamBrogan arrived at the office to find that rope, one end looped and knotted, on his chair. To BamBrogan, it looked like a noose, and a clear threat.