Martial D
Senior Master
Well, that really depends on how much you've bought into the "lethal moves" myth and how much control you have.
Power is nothing without control, and if you can't control it then you have no business practicing it. You might as well just carry a hammer and be done.
I can kick through (at least) a 4" concrete block - I can kick a person with the same technique at the same speed but with control and while they know they've been tagged it probably won't leave a mark.
That's not because they've magically trained their bones or skull to not fracture...
That's why it's called sparring and not just fighting.
If you can't stop (or at least seriously reduce) a technique at any point during it's application you choose, then imo you don't fully know that technique.
This is also where partners that are too compliant (or only resist in the right way) lead to false confidence in the moves and perpetuate the myth.
If someone gets told "if you don't react in this certain way then this move will break your wrist" then they'll react in that way. They'll resist as they're instructed for fear of damage.
But what if someone knows how to resist differently and can shut down that move every single time? What if they actually analyse it and come up with a better working defence? They get told they're not doing it right...
So, the only danger involved is from someone being so used to a certain reaction from "someone who knows how to receive" getting frustrated at their move suddenly not working and losing control.
Let's say a wrist lock - if I'm in a wrist lock and don't comply, it has the potential to seriously damage my wrist.
And if I choose to not let it get applied?
Exactly this. Nobody is giving up their wrists like that. I've got thousands of hours of sparring against any style you can name, and it just doesn't happen, like ever.