Watch the guy up front row in the brown shirt and sunglasses in this video. Hes turned but he moves his right hand over his left arm right as Kirk gets hit.
It was very likely someone in the audience with a zip gun or hidden pistol.
They are pushing the "man 200 yards away" narrative, and there isn't even a suspect. That's disinformation.
The shot arrives at the very instant of the sound. No way does the shot come from distance unless maybe it was a subsonic round but using that type of ammo at 200 yards?