That is true, though Kabuto tends to have his back turned to the enemy when executing his Rider Kick. So before he swings his leg around the Weeping Angel would be already in front of him. So going into Clock Up would slow one down enough to keep track of it.
How would they look like in Clock Up space? They would probably move normally. The main reason I asked is so I can see if putting in a Decade: Kabuto Form battle with the Weeping Angels in my Decade/Dr. Who crossover idea would work. Plus it would be amusing to see a normal-motion Angel doing those typical kaijin poses, e.g. crouching with outstretched arms...etc.