hammering a knife tip first into oak then prying (vic said he pried pretty hard) "light" use.

but aside from that, idk..
it seems tips on knives are always the weakest point, and just because one breaks doesn't say much about the steel...
IMO.
it looks like a pretty clean break.
I have seen where a ranger rd9 broke, and you could tell there were chunks taken out of it (it was stuck in a tree and pried on lightly to try to fix a bend in it. though it was a pass around so it saw alot of use before that, but still) not a clean break like that.(and raners are pretty tough)
if tips are think, they will break no matter how good the steel is.
thats just the way I see it, but idk if it makes sense to some of you.

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sorry to here about that vic, thanks for the test though!