This is a trebuchet catapult.
This is a schematic of a trebuchet in action:
Note how limp it keeps it's "wrist".
[Really no surprise - there is no "muscle" to keep the wrist in any one position - it is after all just a rope!]
But man, oh man!
Just look at that great "wrist" action - seen even better in this simulation:
Sort of reminds me of the great "wrist action" in a tennis serve strobe photo:
The above doesn't conclusively "prove" the "wrist snap" in tennis is a passive motion, resulting from a "loose wrist" being allowed to move quickly through its natural range of motion because of forces being generated much more proximally
But it does get one thinking ...