Pantherlily's Height = 115px = 1.93 meters
Explosion's Radius = 107px = 1.796 meters
The distance Pantherlily traveled = 595px = at least 9.986 meters
9.986/1.796 = 5.56 (Pantherlily was moving 5.56 times faster than the explosion)
"Typical detonation velocities in gases range from 1800 m/s to 3000 m/s. Typical velocities in solid explosives often range beyond 4000 m/s to 10300 m/s".
Assuming the explosion's detonation velocity is 1,800 m/s: 1,800 m/s x 5.56 = 10,008 m/s (or Mach 29.17)
Assuming the explosion's detonation velocity is 3,000 m/s: 3,000 m/s x 5.56 = 16,680 m/s (or Mach 48.63)
Average = 29.17 + 48.63 = 77.8 77.8/2 = Mach 38.9
That's High Hypersonic. Azuma was able to dodge Pantherlily quite comfortably, so that means he (and anyone who is as fast as him / faster) should also be at least High Hypersonic.
Now I'm not a scientist and I only know the basics so I guess this is as far as I can calculate unfortunately. I still don't know how fast Purehito had to be to dodge two High Hypersonic characters as casually as did and how fast Laxus had to be to blitz him to the extent he did.
So what do you think guys? Was my calc any good? And if someone could maybe answer the questions I have that's be great as well. ^_^