My first attempt of calculating anything:
K.O attacks the moon: https://www.youtube.com/watch?v=lhXxmR2RSXE&t=27s
According to Camtasia, from the moment the attack leaves K.O's hand and the moment it explodes at the moon, 3.10 seconds have passed.
The moon is 238,900 miles away from Earth.
238,900 / 3.10 = 77064.516129
K.O's attack speed: 77064 miles per second, or Mach 361581, which 41% of the speed of light.
Relativistic
What do you guys think?