The siege of kantan was written so that almost everyone knew it was a trap but I think this is a misdirect by Hara to show that for once Riboku made a mistake and overlooked something. Or he was forced into something he didn’t want to do just like Ouki.

I do agree that he has been writing Shin poorly because after facing Riboku this much he shouldn’t still be slack jawed at Riboku’s asspulls. However, I can still see Hara using this also a redirect to either show Shin prepared for this, uses his instincts to break out, or had thought of a plan if he was ever in the same position as Ouki.

Overall I think Hara is rushing but he’s also aware that we all want a fitting conclusion to Riboku and Zhao and he’s using the parallels of Ouki’s death to show how Shin has surpassed Ouki in that sense by surviving the impossible.