Though the party had thrown their all in to attacking it this last rat somehow stood still.  Some part of Gorosk had to admire its ability to take such a thrashing and still fight for its life.  For such a small insignificant beast it was fighting through a lot of pain and blood loss.  Under other circumstances such a display might have caused Gorosk to want this to end in a non-lethal way.  Perhaps were it a man they could have paused and settled things in another way.  But it was a filthy rat, not a man.

Gorosk seeing the damage done to another of their party by this final cursed vermin puts other possibilities aside and lashes out with two kicks, hoping to make good on the injury caused by Vah'Lux's Axe and see the wound widened.