This is a prime example of someone who should NOT be allowed to own or handle a gun! He's breaking the second basic rule of safe gun handling. (The first is that you always assume a gun is loaded, and handle it as such, until you have completely inspected it yourself, or a qualified person has done it for you if you are unsure of how to do it yourself.) On second thought, he's probably breaking the first rule, too, unless there was someone on stage who could show him the gun was empty before he picked it up.
Do not put your finger on or over the trigger until you are ready to fire. His finger should be off the trigger, pointed straight, parallel to the barrel.
I'm not going to go into the position of the gun, etc.