Hiyoshi didn't know anything about the nature of Inui's experiments, and he didn't need to. Scientists always thought their experiments were more important than they really were. Hiyoshi's job was to ensure everyone was evacuated safely, and you better believe he was going to see it through.

"All necessary machinery is hooked up to backup power, and the special containment area has been secured remotely. Please come with me, I have been authorized to use force if you do not comply."

He was within a meter or two of Inui now-- close enough to engage Inui if that was the route he chose.