Sans speed thingy

[The_Pink_God]

Ok so apparently from what I understood, the speed scaling to Undertale is:
Everyone scales above Greater Dog's Transonic attack this receiving a Supersonic rating, which is fine, ig...
But explain this

Speed: Supersonic attack speed (Able to consistently tag Frisk), at least Supersonic+ reactions (Capable of consistently dodging Frisk to such a degree that they could never land a hit on Sans, even if they reset and knew exactly what he would do and where he would be, and even if he was asleep. Was only hit after Frisk broke the rules of the game to do so)

Why does Sans have a Supersonic+ rating for continuously dodging, that makes no sense
Since when a Supersonic rating (Which I suppose it's baseline Supersonic and thus Mach 1.1) having a scale would reach Supersonic+ (which starts at Mach 2.5 FYI, a whole lot 2.27× faster) simply because it dodges an already Supersonic attack?
Why does dodging Supersonic attacks make Sans Supersonic+? I don't get it
Someone care to explain

 

[Livinmeme]

I think is from dodging the gun thingy

 

[The_Pink_God]

Guns are normally Supersonic last time I checked
Did they just take the highest value and put it there or smth?

 

[The_Pink_God]

Also, said gun or Empty Gun has extreme similar appearance with Colt Guns
I would say it's probably Colt Python or a Colt Anaconda
Both of which, can reach up to Supersonic speed