I'd have no defense for a seal attack. How can I armbar an animal with no limbs? How can I choke it when I can't even get my arms around it's neck? I guess my best bet would be a modified triangle with no arm, but that just sounds like a pipe dream, really.
Either way, I'm doing everything in my power to keep top position against that thing. If he puts me on my back and gets his weight on me, it's all over but fat lady singing. Hopefully my speed and agility advantage would carry me through the endeavor unscathed.