We are NOT playing Spacebattles here, we are explicitly going by abilities which can explicitly attack and destroy concepts, we are not going to pretend Regulus' ability is beyond that without any proof whatsoever. Masterblack's point is that Alexandria in Worm has a similar ability and in practice, it doesn't work in that same fashion either so we can't just say "Because how it works in Re: Zero means it works the same everywhere else" as that's in and of itself a NLF.
No? She kills him regardless, this shouldn't even be in question. There is no stalemate unless you can prove:
1) Regulus' ability is explicitly conceptual in nature
2) It's utterly beyond the ability of Excalibur to deal with in any fashion.
Me and Cross have consistently stated evidence against both while Paxton haven't proven shit. That's how this works here, we are not Spacebattles. It "being created in time" doesn't matter when Divine Constructs have destroyed Concepts enforced by gods who see Space, Time and other shit in completely different fashions and can erode Reality.