"This afternoon, shortly after you were called to the checkpoint, there was a brief disturbance in the lobby. A man shouted as in alarm. This was one of the medtechs you summoned for the old grocer Uekiya-san. The Chairman heard this shout and inquired and learned of the initial incident with Uekiya-san and his gun. The Chairman became very concerned, as Uekiya-san has been coming to the Open House for many years. The Chairman decided to investigate the situation personally. He was passing through the lobby on his way to the checkpoint when the explosion occurred.