Yeah, you have to gorilla-grip a frame-lock to have any influence on the lock (even if minimal to none). My reinforcement is really aimed at the flipper "appendage". For normal saber grips, your finger keeps the blade locked-out pretty well. Again, I only mentioned a hammer-style grip as that was the concern (self-defense and failure). If I'm using a pinch-grip or holding it lightly, I'm likely not doing anything (at least that I can conceive of) that would put pressure on the spine of my blade.
My point about limp-wristing is spot on with respect to the test that was being conducted. I would certainly have to hold my handgun in a way that caused it to fail...much like the holding a knife in a pinch grip and whacking the spine on a roll of tape. If I'm holding my knife properly for harder-cutting tasks, the likelihood of inducing that kind of failure is close to zero. Still, I think there are some issues with ZT's design, the steel lockbar inserts, and potentially their mechanical tolerances, so one can't be naïve about thinking a heavy duty folder is designed for fixed blade tasks regardless of the advertisement. My whole disagreement is that the video testing is a poor example of real-world use and a lot of "what-if" hypothetical scenarios are irrelevant. Just because I can purposely induce a failure to feed in my handguns doesn't mean it's a design-flaw, it's an end-user error and improper handling of the handgun. In my world, you mitigate "what-if's" by reinforcing proper planning, training, and using gear properly and purposefully. Again, the real world where I live beats table-top tests everyday...labs are and table tops are great ways to show potential design issues (which I can appreciate), but they don't often represent reality from a user's perspective. Just my humble opinion.
ROCK6