Well, this development looked to be in his favour. It took all of five seconds for Vaati to become smug.

"Ha! So much for your raccoon thing, hmm?" the mage sneered. "Now, my keese, finish it off!"

Since Zubat has the amazing variety of two whole attacks, it swoops in for another Leech Life. Which... could hardly be considered "finishing it off", since Leech Life does crap damage anyway. But at least all that blood-sucking is keeping the little bat nice and healthy, so the odds were on its side.