Void's slashes, as they have appeared in the past, clearly travel across x and y, as he's dragging the sword toward his target, even if they "
appear" instantaneous. A far different feat from said slash appearing directly on
Saitama (more accurately, above.) Interference from the dimension void accesses ignores distance, not time. Obviously, it takes time for him to drag his sword across the landscape because our universes have time, but I wonder if that dimension itself also has time.
Also Blast being able to control his stumps is a meme.