I threw it into trees hundreds of times and it never flinched
And that's what I been waiting for. Toooj said there was one in the works, but he didn't have it in hand. So, yes, to date, there has been one broken BK2.
Throwing a BK2 into a tree was the only way that Ethan said it could be broken without the use of power tools, or absurd OVER ABUSE. Knives tempered to RC59-60 are not throwing knives. Throwing knives are tempered to be rc50-52, for a reason.
Impact creates a harmonic resonance in the steel that hard tempered knives cannot take, I don't care who makes them. Throwers are tempered to allow flex when the impact vibrations pass along the length of the blade.
The BK2 began making micro fractures internally from the first time you threw it into a tree, after that they just got bigger, until when you dropped it into the stump, that was the last straw, more than likely because the angle of the stump created enough angular force to go ahead and snap it.
I don't throw knives, or at least knives not made to be thrown, that's the quickest way to break one of hard tempering. Check the stats if you wish, but you broke your knife, and its not the knifes fault, its yours.
Moose