I really like seeing Kudou in a moment like this, it humanizes his character more opposed to him always being composed. Just goes to show Yuusaku was right about him still being "green" in certain areas and having a bit more of a way to go until he can successfully be where he thinks he is.
Lol kogorou always doing his own, wrong, deduction is so funny to me. Also this case shows that without Heiji Kudou would have let the culprit go. He is not always perfect and can let his emotions get to him.
Shinichi mentioned before that he's willing to bring even his closest friend to justice but only after he tries really hard to prove they're not the culprit.