I don't believe NTDante's speed is equal to Vergil's.
Therein lies the problem, because what you believe doesn't have much bearing on some of the facts that are put forth by the games they come from :/
I dont know exactly what you mean by "spacial" placement, i am guessing your implying that hes teleporting instead of blitzing (blitz =insane speed)?
Yes, "spacial" regarding teleportation. He's appearing in a specific "space."
I dont see him teleporting if thats what you meant. I see him moving from point A to B fast.
And if you think because there are very few frames from point A to B (when attacking Beowolf) and you conclude that its teleporting - then thats your assumption.
Or, the fact that Vergil's Tricking is specifically described in-game as instantaneous teleportation to specific spot. No assumption, that's a clear fact from the game's description of his Trick abilities.
Dark Slayer Style - Air Trick in-game description said:
Instantaneously teleport to a spot directly near the enemy
Now as for NTDante's "halt anything in it's tracks", if that was entirely true then he would have used it in first place on Mundus. And is it even a ability that he can use on and off? Or is it 1 shot only?
Infact he could have used it when NTVergil was being sucked in by NTMundus.
That's all true, but it's the same theorycrafting behind me saying that if Vergil was truly as fast as claimed he should have won every encounter evar~
The difference here is that Dante's DT-powered halting ability isn't a one-off, it's used all throughout the game, and is specifically used to freeze Mundus in place to save Vergil.
All we can say when it comes to "why didn't he use it the second time to save Vergil from getting sucked into Mundus' form?" is that the narrative wasn't written that way *shrug* But he still did it once before, giving it credence. Vergil's "blitz" speed isn't really documented in cutscenes as something he could always have used to win all his encounters.
Plus before you can conclude with a a little certanity that it would affect Vergil , youd need to know how the ability works, and how strong NTMundus is compared to Mundus.
That's the rub, we don't know, because we can't quantify "magical power" used in two different universes, at least not without skewing one way with bias. I'm just playing devil's advocate here.
All we know is that it freezes demons in their place, and it was able to halt the demon king who calls himself a god. Vergil is only half-demon, which means that whatever Dante has that works against demons, would work even better on Vergil.
And before we talk about how DmC Vergil wasn't affected by Dante's DT in their final battle, remember that DmC Vergil is also a Nephilim, just like Dante, most likely making that ability ineffective.
As for Vergil's speed or Katana use has with the weapon to do, and thats why Dante can do the same? No, that doesnt seem likely. And Dante being able to do speedy stuff and Yamato swordsmanship has more to do with fact that Dante in DMC4 is alot order than he was in DMC3, hes brother of Vergil, therefor he knows the swordsmanship and pays tribute to his brother, and that its gameplay...things happen in gameplay that doesn't in story or cutscenes relevant to it.
Then you're going to have to decide what elements are allowed to be taken into consideration for stuff like this - gameplay and cutscenes, or just gameplay? Because we're going to have to apply it to both classic Vergil and DmC Dante.
No take-backsies either.