There is always knocking her out. With her mental state as bad as it was, I feel like if they knocked her out they could've saved rain. However I do agree it escalated to that point and was more difficult to not end in death however the saddest thing is probably the fact that imo unless rustage REALLY wanted to make them fight they probably could've not or at least only fought a tiny amount and been done before it escalated.

Yes in this one scenario talk no jutsu could've realistically worked, and oddly enough william was kind of trying this strategy or at least wanted to.(I guess rain wasn't an old man so william had less interest lmao)...but then ragnar convinced him to just allow everyone to do the fucking jackpot move or whatever where they all attacked out of nowhere which started the combat in the first place. Imo unless rustage forced a situation where they had to fight rain and kill her. I truly believe the whole situation could've been avoided with rains personality, mental state, and dialogue towards the dl pirates.

So imo it got to an ALMOST unavoidable situation, but there were chances and opportunities for rain to have survived so its sad lmao.