@CruallassarIt had detected the air pressure from hundreds to thousands of feet away and preemptively dodged. My character's specialty is super senses, afterall. He can't predict the trajectory of close range attacks in slow motion like in the Matrix though. I know that mach three is fast, lots of feet, calculations aplenty. Just know that though the energy from the dynamic pressure may be most noticeable from ten feet away, it can still be detected from much farther. It just takes more, shall we say, finely tuned instruments. Your character can fire supersonic arrows, and mine in all fairness is decent at not getting one hit killed by them.

As for its exact speed, let's just say it is fast enough to be able to stand a good chance against another pure melee character in a contest of practical skill.

@Cruallassar
I would assume so, as generally in my experience magic can affect things on the ethereal plane

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Magic in general yes, however since your spell description was that you manifest the shadows in physical form, and since shadows are not an inherently ethereal part of nature, it begs the question.

<Snipped quote by Cruallassar>

That specific spell yeah, but its more of a case by case thing