Thanks Caveisier. I wouldn't call it a bug so much as a consequence of limitations of the mod and toribash more generally. It's not possible to make very realistic sword in tb, and so it is with these swords. It may help to show what the sword looks like inside:



Body part gets dismembered when it clips through the outer blade and touches the inner isntagib piece. Sometimes it happens easily, other times it doesn't happen when it seems like it should. It depends on several factors (like the angle of the blade and where you hit). It's not always gonna seem fair unfortunately. In your replay it looked like the sword clipped a little through but was just shy of reaching the isntagib piece, so no dm/trigger.