Here I am performing Dai Vernon's Slow Motion Card Vanish.
https://youtu.be/vWCb5Yf0uOM" target="_blank
This got me to thinking about something. Unless a card trick actually needs more than one person for whatever reason, most card tricks could be done for just one person.
But what card effects do you know (like the vanish I did above) that can ONLY be performed for an audience of one, or for a single camera perspective? Perhaps the method is impractical, or the angles are brutal, or for any other reason the effect can ONLY be done for one other person.
Any card tricks pop to mind?