First things first - set up a camera to record!!
Don't climb, get a good "throwing rope" and pull up an attachment point tied to two long lines as high as possible.
Snatch block w/ the two lines at a about a 90 degree angle with the desired fall line bisecting the angle.
Pull as much as possible, if you've got 2 good come-alongs or winches you should be able to put about 6,000 lbs of pull on it.
If it doesn't fall then release most of the tension and do some cutting. Pull again.
Post pictures.