God knows there were enough bitches eating crackers in that room to spare some.

Then talk no more of flight, it is no boot.

Through this species of prosaicism, Cowper, with scarcely one of the higher poetical elements, came very near making his age fancy him the equal of Pope […]

So I still think that Immortals in fact can kill on holy ground but won't do it if any reason is left to them, at least not take another Immortals head, because it is an deeply ingrained Taboo (like, say., kannibalism or something) and they just feel that there might be dreadful consequences.