Actually, since Tomas literally ran away in his last post you've just drawn Shax's attention onto Blake. HE is now her target after his usage of considerable power, which Shax takes as him being an amusing challenge, unless of course you somehow manage to come up with an argument that'll get her to stop.

Though if you try, it's better not to mention peace. Shax is pretty damn one-dimensional.

I mean, so far the only reasons people have given Shax to stop fighting is 'we could be the only non-humans left!' or 'Our enemies are the humans!' and things that might work on a normal person, but not to someone who loves fighting to the death no matter who or what her opponent may be, or what the state of the world in general is. You've got to appeal to her from that perspective, understand what she wants and offer her something that's far more tempting than to kill all the opponents around her. Something she can't get on her own.