In The Eminence in Shadow episode 2, Cid is "training" with Claire and when Claire is about to slash him, he moves so fast that he's able to side-step, slash his sword 4 times, go back to his original position, and pretend that he got hit. After the fact, Claire acts as if nothing abnormal happened, as if Cid had never done anything, but she feels a small chill on her neck (where Cid almost slashed).

The human eye can't see things moving faster than 550 mph (which would be ~1.6 the speed of sound).

But is moving at Mach 2 speed enough to replicate what Cid did? Or would it have to be a whole other scale like the speed of light?

I'm looking more for a ballpark rather than an exact number, just so I can understand what is Cid's speed.

Cid slashes Claire 4 times and pretends nothing happened

At what speed does he move? Sound? Light?

Other instances of his insane speed:

  • I found this, which could suggest that less than the speed of sound would be fine with some assumptions. I guess there is a better SE for the question?
    – sundowner
    Oct 20, 2023 at 23:08
  • Probably way easier to do with magic tricks like instant hypnosis.
    – Ocean
    Nov 15, 2023 at 11:54


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