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So, firstly All Might and All for One are both High Hypersonic just for being faster than everyone else, which as far as I know is a fairly controversial thing to do by itself but eh. I suppose that can stay if people really want it to.
What I'm here to address though is where this scaling came from in the first place, that being Bakuguo reacting to his own explosions. This, as far as I'm aware, isn't actually true. He can set off an explosion and then react as the shockwave propels him forwards, but this isn't the same as dodging an actual explosion.
Firstly, the speed is misrepresented. Nitroglycerin has a detonation velocity of 7700 m/s, it does not move that fast through air. The detonation velocity is simply how fast the shockwave moves through its own material, basically how fast the explosion spreads throughout the thing being detonated. It is not how fast the explosion is in air. You can see this by using the UN explosion calculator, in which shock front speed varies on weight and range, not merely material.
Second issue with this is that blasting yourself off with an explosion does not make you actually move as fast as said explosion. I obviously can't link examples of this, but if you've ever seen someone get hit with a grenade it's pretty plain to see that they are not being blasted off at supersonic velocities.
Now as for the feats that aren't Bakuguo, I'm not sure if anyone actually reacts to any explosions in those either. For instance in this sca All Might isn't even able to avoid Bakuguo coming from behind despite knowing what he was doing, all he can do is raise his arms to block the explosion. And in this sca nothing happens at all, not only does she fail to avoid the explosion she gets hit head on even though Bakuguo telegraphed the attack.
What I'm here to address though is where this scaling came from in the first place, that being Bakuguo reacting to his own explosions. This, as far as I'm aware, isn't actually true. He can set off an explosion and then react as the shockwave propels him forwards, but this isn't the same as dodging an actual explosion.
Firstly, the speed is misrepresented. Nitroglycerin has a detonation velocity of 7700 m/s, it does not move that fast through air. The detonation velocity is simply how fast the shockwave moves through its own material, basically how fast the explosion spreads throughout the thing being detonated. It is not how fast the explosion is in air. You can see this by using the UN explosion calculator, in which shock front speed varies on weight and range, not merely material.
Second issue with this is that blasting yourself off with an explosion does not make you actually move as fast as said explosion. I obviously can't link examples of this, but if you've ever seen someone get hit with a grenade it's pretty plain to see that they are not being blasted off at supersonic velocities.
Now as for the feats that aren't Bakuguo, I'm not sure if anyone actually reacts to any explosions in those either. For instance in this sca All Might isn't even able to avoid Bakuguo coming from behind despite knowing what he was doing, all he can do is raise his arms to block the explosion. And in this sca nothing happens at all, not only does she fail to avoid the explosion she gets hit head on even though Bakuguo telegraphed the attack.
