The short pulse won't kill you, will it? They say that another doesn't get sent until the remote agrees that the prior one was safe, so if they have some way of detecting a problem that should solve that.
But... what, and how, can be detected? I am thinking that the sender can say how my power there was in the pulse and the receiver can check that the same amount arrived. Would that detect a potentially fatal grab? I am not expert enough, but I am also reminded of the table saw safety feature that shot a bolt into the saw if it detected a finger about to be chopped. On the face of it I would have said it couldn't possibly react fast enough, but I've seen the videos of saveloys being shoved in and coming out unmarked. I note that no-one ever used a real finger in a demo.
It's probably worth pointing out that 'non-fatal' doesn't necessarily mean 'unnoticeable'. If you got a tingle, even a large one, I think that would count as working but would ensure you wouldn't keep doing it just to see if it works. Whilst safety devices should be tested often, you don't test them for real - you /have/ to allow that this one time it won't work. Doesn't invalidate the device, though, since it only has to work once to have been useful.