That's stupid bulls***.
"I shouldn't kill their most senior and capable commander because... waahhhhhh they must have hidden ambush force somehow that none of our scouts spotted wahhhh I'm scared look how good his manners are"
get out of here.
That's not believable at all.
Even there were SOMEHOW an ambush force that none of your scouts saw, you could still easily kill ryumon then retreat and it would be worth it. It doesn't make any sense to panic so hysterically and believe you need to retreat RIGHT NOW
This is meant to be the commander of SEI? Give me a f***ing break. If she was this kind of hysterical , irrational woman then she never would have been able to inspire capable men to follow her command and carry out her coup of Sei in the first place.
also this "you have to kill Ryumon personally or your honor will be tarnished"
Is BS as well. Commanders sent soldiers to kill/capture enemy commanders all the time.
What a badly written manga.