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I did a basic KE calc on the strength of Raiden's swing, using his sub-rel combat speed calc. Using this KE calculator and 1 kg as the weight of the sword, I got a result of 3.24419E+15 Joules, or 77.538 kilotons of TNT.
Character A was calculated to be able to punch with an energy of 50 000 Joules. Assuming his fist weights about 0.5 kg, it needed to move at least with Mach 1.3 to get that much energy. So the attack speed of that character and the speed of everyone who can dodge his punches is supersonic.
Basically the same thing as the OP's calc, but with the forumla slightly changes. You could only get KE from Raiden's speed if the game gave you something first.
I do not know anything about the verse, but there's nothing wrong about the calculation in the original post as far as I know. It's specifically calculated in the blog that Raiden swings his sword at is 8,055,445.59 M/S and it's simply just calculating the kinetic energy of his swords moving at said speeds.
Likewise, input from other members knowledgeable about the verse would be invaluable here, as I do not know how this would intertwine with consistency.