User blog comment:Muhammedmco/To Aru Majutsu no Index - Gunha slams light lightning/@comment-33240622-20180922053731

Checking this part of the calculation here.

"Gunha's speed = 2.3750441 / 6.810666667*10^-9" Don't use the Mach number. It's easier that way.
 * The value of this calc results in 348,724,172.9 m/s, or 1.16x FTL.
 * When figuring out how much quicker a character is compared to the speed of light, always divide your result by the speed of light, or approximately 300,000,000 to do so.