This occurs in multiple species that are not otherwise known for caudal luring (wiggling their tails to attract prey). It seems to be a case of overstimulation - think of a hyper kid with a sweet tooth who knows he's about to get a piece of cake. The snake smells the prey item, it's about to eat, those feeding instincts are going a mile a minute, and the tail wagging seems to be kind of an outlet for the excess energy...you know, since snakes' mouths don't water when they're amped up about food.
It's fun to see, isn't it?
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