Just as Fushimi Roku mentioned, half an hour had already passed since the agreed pickup time. If it was a delay due to a flight delay, that would be understandable, but if it was for any other reason, even if the boss didn't say anything, Fushimi Roku would still feel uneasy—he has always hated waiting for others and doesn't like others waiting for him either.
So, after the Criminal Police team arrested the suspect, Fushimi Roku made a deal with them. Either they pretend the two weren't present and let the Criminal Police take full credit for solving the case; or follow protocols, making everyone who reads their report think that this group of criminal police isn't as good as two newly graduated patrol police.
The leading criminal policeman chose the former and let them go without a word. As for Watanabe Shun, Fushimi Roku claimed he didn't really know him, so the police should handle him as they see fit.
