Those are very good; my point was that IMHO the speed differences can go too far, to the point where the "techniques" become unrealistic, because when both people are moving at or near full speed, there is no chance one of them can suddenly start moving 3 times the speed of the other to achieve a tactical advantage.
Look at the short exchange immediately following your first example, at 0:51 - 0:54
At this point:
the attacker basically stops, allowing the 'technique' to take place, and Vlad is moving at about twice the speed of the attacker. That would not be possible if they both were ALREADY moving as fast as possible (which IMHO is likely to happen in reality.) I think that if that stab was going at full speed, Vlad would do something very different to defend against it.
I'm all for slow training, as you know, it's been a big part of my own training, but the speeds have to match (at least more or less), otherwise it becomes unrealistic IME.
(Anyway, just MHO... I ain't no knife fighting expert, by any stretch of imagination.)