Sorta . . .
**bit of an edit in here -- for those interested**
My suggestion is to wrap the tree a few times, at a nice angle to help direct the fall, and associate it with a detonator and/or a "much slower" fuse.
Det-cord was a plastic explosive designed to be used as an instant fuse. It has a very fast rate of burn. If you were to loosely wrap one end around your ankle and had someone else -- **even half a mile away** -- ignite the other end, there is no way you could avoid losing the foot. There would not be enough time to even step out of the loop.
Det-cord = very nasty stuff