This Blog contains the justification for Axel's first key speed rating.
Combat/Reaction Speed[]
Axel is able to keep up with Hex, who can slash twice before a winter fae solider could see his blade.
First off, Hex is 175.514 cm tall. This makes his arms 77.47 cm long. His sword, Stem of Spring, is 81.28 cm long. So, we'll calculate his striking distance.
pi/2*(0.7747+0.8128)= 2.4936 metres
Hex slashed twice, so... the total distance he slashed is 4.9872 metres.
Winter Fae Soldiers can process images twice as fast as a human can, and the average human can process an image in 0.013 seconds (13 milliseconds) This would mean that Winter Fae Soldiers can process images in 0.0065 seconds, or 6.5 milliseconds. With that, we get hex's striking speed.
4.9872/0.0065= 767.26 m/s, Mach 2.23 (Supersonic)
Travel Speed[]
Axel and Hex travel through the entirety of Halka Cavern within a second. Halka Cavern has an area of five acres.
5 acres= 217800 sqft
217800 sqft = 466.6905 feet
466.6905 feet= 142.24 metres
The time frame is 1 second, so...
142.24/1= 142.24 m/s or Mach 0.41, (Subsonic)