This was just a play bite, and there was no aggression. In fact, there was no reaction at all. It was hilarious to watch. The bite happened after several minutes of being ignored, but that didn't even work, and the cat walked away disappointed.
My cat bites me all the time and I love it. That's because his "bites" are gentle and never hurt. It's just enough to remind me that "I could shred you if I wanted to you know." He never swats with his claws extended either.