Of course, when something pulls Finn under, he's turning to look, and has enough presence of mind to frantically backpedal, perhaps narrowly avoiding being grabbed. "Kraken!" Whether it is technically a kraken or not is irrelevant; the intent is to shout a warning. He's switching to [Black Mage], fearing the worst- but he's not exactly the most agile swimmer. There's only so much maneuvering he can do.