Infinite and Immeasurable Reactions

[XitSign]

Just a simple question, because I'm unable to find examples.

Can a character have Infinite or Immeasurable reaction speeds, but a measurable movement speed? If so, how does that work in application for the character who can not move that fast but can 'react' that fast?

 

[Thelastmlg]

They can, is rare but possible, reactions are being aware of stuff and doing short movements because of it, like dodging.

In this case, they would basically be untouchable by finite speed attacks, but whenever they run and stuff they would move at finite speeds

 

[XitSign]

I had assumed that's basically what it would mean, but the unique nature of these speeds made me question if a character like this """"""""logically"""""""" works or not