@blablablub @G01dmaster
It was considered as official samurai clans battle and even with huge number advantage they couldn't win/ push. So they decide to use archers to end the battle what is very safe, but also considered coward way to end. I mean they won no matter what at this point, but they throw away warrior honour and meaning/ way of they school/ skills. So they not saying that archery is coward, but that they are cowards as they don't have balls to do even like 20 vs 1 (or more) - so in the end the proved that theirs skills were better and that was good enough before dying in fight anyway.
It's quite different than using archers at start/ during of battle or during the war in general.
It goes with all of the warrior philosophy (honour and death) and respecting enemy warrior who shown amazing skills or honour in battle. Also similar things were part different cultures like ancient Greek or Rome (etc) and overall ways of Knights, Vikings and so on. General conduct was different in some parts, but idea behind it was the same.
So this part is actually quite accurate to how it would be seen.
As for Nanao we need more backstory. My guess is this will be trauma of losing family and decline/ betray of her clan.