Besides POTUS, these reactions are neither fear nor confusion, which would be expected. They're shock. Like Jeb upon seeing the photo.
And POTUS was viewing the reaction rather than the event. Yes, he knew he was safe. Dasting.
Stings are designed to catch those who thought it would be a real event and assisted.
But they can also be designed to cause the reveal of important facts based on the digging that ensues.
Been happening since 2016.