User blog:Phoenks/Irina Speed Feat

The Feat: ''As soon as the battle begun, their was boom as Irina instantaneously broke the sound barrier. Kadri was shocked at her speed and just barely managed to react to her first strike which not even the cameras could capture.'' This school uses very high end cameras which they have mentioned to record over 500fps

Assuming she crossed half of the stadium to get to Kadri, she would have to have moved 50 meters in at least 500th of a second.

25,000 m/s or Mach 72.8

At least High Hypersonic+

Next, she does another crazy speed feat "Kadri could barely keep up with her, her sword swung at speeds faster than even her shadow could keep up with. There was sparks of electricity forming off her blade from pure kinetic energy."

This is much easier to calculate as The Speed of Dark = The Speed of Light

So at the very least she must have been attacking at speeds FTL