The gun-bearing equivalent to yelling fire in a movie theatre is brandishing, and it is a felony just about everywhere. Its a pretty basic concept.
https://www.usacarry.com/what-does-brandishing-mean/
I think it is a close call in this instance because a case can be made he was merely spoofing the media stories about the movie could inspire violence.
In other words, no intent. If it works for Clinton, why not?
Good grief man a PICTURE is not brandishing, not even close.