I don't do that, and why? Because thats not smart to say you didn't do what you did do. It gets people thinking in the wrong direction. I just emphasize on what they think is happening. If I do a DL I won't say something like "And of course I wouldn't use any fancy card moves to do that."
You completely fail to see my point. In certain effects, we use recaps before the revelation to emphasize that what we did was impossible. We use subtle comments as well, and we use convincers.
We tell them that what we did is impossible, when in fact, any five year old can repeat the technical workings after reading through a magic text.
Most importantly we NEED to protect our secrets from laypeople.
And I would like to point out that there are several stage effects that Criss has done on television, that require the audience to be in specific places. So he uses stooges and camera editing to safely show viewers at home.
These are the same effects that are done in stage shows across the world. Does the stage magician have to have a caveat for his audience that although he is doing it live, it would not be a very magical show if they were sitting up higher, or to the sides of the stage or behind the stage?