I didn't like this at all. I'll go ahead and say it, since nobody else has.
This is, I think, what happens when you take a great plot, method, and effect that is not designed to be performed on stage while surrounded by cameras (due to angle-sensitivity) and try to perform it on stage without changing the method. I am fairly confident this is not how she usually performs this effect.
This raises the question: Why not change the method to make it more stage appropriate? And I have a theory on this too. First, I know for a fact that Ekaterina is quite familiar with, and has great respect for, the new (very new) method I think she used. She is also almost surely familiar with the older, very well-known method, and I'd be very surprised if she can't perform it well. I also think the older, well-known method would have been the logical choice here from the point of view of effect presentation, it being significantly less angle-sensitive.
There is, however, a possible advantage gained by using the new method. First, P&T may not know of it as it's really very new (as in: this year new). Second, she may have been hoping that P&T would have guessed that she was using the old, well-known, method. If they had leapt to that conclusion, she would have technically counted as fooling them. (They hate this kind of attempt at fooling them, but it's not uncommon.)
This is all speculation, but it is speculation that does make a lot of sense. Supposing P&T are not familiar with the new method, why didn't they just guess that she employed the old, well-known method? Probably because the manner in which she performed the switch was so bad (from the point of view of either method) that they didn't have any clue if she was using a known method at all as opposed to something like brute-forcing it.
I *think* she tried to give them just enough to think she was not that good at performing the old method to get them to select that option, but in the end, she didn't give them enough to permit them to think that she was, in fact, using it. At any rate, that's where my money lies.