During the incident, he was demonstrating the technique necessary to Graves, not performing an actual experiment. He was a bit of a show-off and was doing the d

During the incident, he was demonstrating the technique necessary to Graves, not performing an actual experiment. He was a bit of a show-off and was doing the demonstration without shims that would have prevented criticality. And yes, all they had were the counters. Other than that, the video is really inaccurate.