Woodpecker fighting a snake

If you want to see something INCREDIBLE head over to my buddy Christopher's Picus blog for a video of a snake fighting a woodpecker.  I just realized that I just swopped the two around as my title says the woodpecker was fighting the snake.  Well you have a look and tell me who you think was the instigator and who was the winner.

Updated video link (12/14): http://vodpod.com/watch/2564915-liveleak-com-woodpecker-vs-snake-a-fight-over-a-woodpecker-nest