(Rathan, I'm not intentionally ignoring the fact that your character can act right now, but since Uriel has posted, and the critter is nearly helpless at this point, I just want to get this resolved...)
Silvercat hefts his mace up, and brings it down on the cavern base, making a loud thud, vibrating up and down the handle of his weapon. (Natural 1) He lifts his weapon up again, trying to find it's path to the small figure (9 rolled), but he fails to connect with it again. (5 rolled) (natural 1) (natural 1) - switched dice - (8 rolled), And after a number of failed attempts, silvercat finally smashes the little creature (15 rolled).
It now lays there shattered, and no-longer spraying it's sleeping gas. You can easily tell that the device is made up of tiny metal springs mostly, but there a few circular looking metal objects...