Fite me, rabble rabble rabble
With that ability, though, concepts such as pressure are irrelevant. Therefore, something affecting a wider area, such as a slap, or better still, a body slam, would be more effective. Additionally, the fighter would want to avoid the other problem, of his fist shattering. Therefore, they would want to actually attack more slowly.
In short, you've created someone who fights most effectively by doing the exact opposite of what most people do to achieve te same thing.
Challenge accepted.
Ricky Hatton's (pro boxer) punch speed - ~25mph
Diameter of a H2O molecule (most common molecule in human skin) - ~0.29nm (0.000000029mm)
25mph = 11176000000nm per second
Deceleration = (0 - 11176000000nm per second)/0.00000000025948461 seconds = -4306999200000000000000000000nm per second per second.
-4306999200000000000000000000nm per second per second = -430699917039m per second per second, or -430699917.039km per second per second.
(If you don't want to read that brick of a number, that's over 430 million kilometres.)
-430699917039m*0.7 (average mass of a human fist) = 301489941927N
(Or three-hundred thousand million Newtons of force.)
So how much is ~300,000,000,000 Newtons of force? Well...
- About 3300 Newtons will break a rib.
- About 250,000 Newtons will instantly stop a car moving at 60mph (depending on the car).
- About 750,000 Newtons are necessary for a rocket to lift off.
- A 50-kiloton nuke delivers about 450 million newtons of force.
- And since I'm running out of ideas, it would take about a 34 megaton nuke directly hitting this person's fist to re-create the damage that one punch would cause to them.
And cookies, Rilla promised lots of cookies.