Oh, so you can parry a bullet wit a sword? That's cool.
No, because I don't have the reflexes or speed.
But let's say a bullet is fired from 20 feet away. If I start moving the sword when the bullet leaves the gun and I need to move my sword hand a foott, I only need 1/20th the speed of the bullet to intercept it. If I anticipate the shot, I could get by with a lot less than that.
Normal humans don't even have that level, but that's all that's required.
Seph and Cloud can also "cover kilometers in the middle of combat". I know there isn't a person alive who has seen the fight between Seph and Cloud in Advent Children.
No they don't, the battle mostly takes place around Shinra tower. Comparable would be if they left and re-entered Midgard during the fight.
Also, remember the big multi-jump sequence where Cloud gets up to Bahamat? Their travel speed simply isn't that high.
They were moving just as fast as any Bleach characters I have seen. You should really watch it again so that you can see what I'm talkin' about. They aint that much faster
than Seph and Cloud.
They might look similar in how fast they move the swords to our eyes, but the action is always formatted at a speed to be watchable to the viewer.
They never cover anything like the distance Ichigo does in some of his fights.