As soon as he comes on, but that isn't the simplest way to do it, considering that you have to hush 50 or so people so as not to expose his "camera editing". That would be difficult to do, considering that if one person talked to someone and it spread, then his show would be off the air. One person, maybe two people is easy to get not to talk, it takes a contract and money, but fifty people would not be so easy to hush up.
As young magic enthusiast who has had the "never reveal how the trick is done to anybody" mantra drilled into you, I can see how you might think this. You would be shocked at how many people around magic shows and magic shoots are "in on it".
I could tell you how I and the rest of the sound crew watched as Harry Blackstone, Jr. set up and tested the rigging for the Floating Lightbulb at a local venue.
I could tell you about another personal experience, a video shoot for a corporate training video, for which I choose and performed numerous magic tricks with a full cast and crew present who, necessarily, had to see how the magic worked.
I could point out how backstage crews all over the world can plainly see the workings of countless magic effects on stages.
And if you took all of the video segments that you KNOW required the spectators to be aware of the workings on the entire run of Mindfreak, I feel you'd faint dead away at the number of people who are 'in on it'. Quite a few more than 50.
That's not including the 30 or so soilders who participated in the Hummer appearance and the soilders and civilians on site at the production of the girl from the duffle bag on the Mindfreak episode set at an Air Force Base.
The fact is, it is necessary for many people in and around all aspects of show business to be 'in on it' when magic is performed. The knowledge these people have doesn't ruin the careers of the magicians or put an end to the art of the performance of magic.
This was demonstrated pretty effectively when the Masked (Valentino) Magician exposed many effects and principles on a couple or three nationally broadcast television shows a few years ago. MILLIONS of people watched. Yet many professional and amateur magicians are still fooling and entertaining people every hour of every day around the world using these exposed tricks.