@Asadlolo
Part of what makes this series so unreasonably fun though is that arguably they fucked up too because Crimson does indeed typically have a point and is in fact quite intelligent. Back at the city he was right that with just a bit more use of planning and a bit less independent action there'd have been a higher chance to permakill the enemy king and that'd have been checkmate right there. Or after they could have properly used his super gateway nexus system and retreated well. And if they'd taken her out at the capital then this whole entire battle and sacrifice wouldn't be happening either. And here Crimson's scheming will also have been a big help to them even with him gone, the teleportation circle wouldn't have worked nearly as well and also the enemy's recognition of the "restriction to humans" and using that to disrupt it was smart and right on target.
Of course conversely, everyone else also has a point that Crimson's psychopathy ends up being an own goal unnecessarily sometimes, that humans are still humans and the paradox of warriors isn't something that can be ignored, etc. Hence the fun! Everyone feels more like a real character, they all act in line with themselves even when that only sort of makes sense and everything is messy just like real human conflicts. Great chapter.
@Bearil
Yeah, kind of surprising actually that someone as normally ruthless/smart as him doesn't have something to deal with that, like a high explosive necklace or something he can trigger by thought (or autotriggers on loss of consciousness) and kills him. Maybe he hates his curse that much though, or maybe it's actually just genuinely rare Crimson is caught off guard badly enough that it happens when it matters.