[It gives Hijikata a lot of satisfaction to see Caster scared of him, much as she couches her fear in threats. How often has she had the upper hand over him on Avalon with her witchcraft and shadow magic? It feels sweet to be able to loom threateningly over her for a change.]

A Holy Grail War? Like I'd cause so much chaos over you being a nuisance. I'd simply take you out - only you.

[If she's the one draining people's life energy to fatal levels, she's the only one who needs to go! (Not that he'd be able to get rid of her permanently, not here.)]

Simply behave yourself civilly, and I won't have to resort to such measures.