Why let the cat do it's thing? You ever see how much destruction one of these things can cause?
I despise moles, I can't count the number of times I've twisted an ankle stepping on a mole run. They ruin your yard, tear up flowerbeds, it is almost unbelievable how much damage just one of these can do. And they are all but impossible to get rid of.
My mom has been fighting them for three years now and still can't get rid of them. Her yard looks like a mine field, she's tried sprays, smoke bomb things, those stupid sonic stakes, you name it, and they are still around.
Not only would I have let the cat finish the job, I'd have stayed there to make sure it got done.
Gale