This is a great candid shot. A solid photographer is always looking for good light combined with a great scene. Knowing your camera settings and having them dialed in is critical to an indoor lighting scene like this. You also need to know how to meter your light correctly to get a good exposure.
But those peach-colored dresses the kids are wearing.
As a full-on tinfoil hat guy, you gotta wonder if his handlers somehow engineered any of this shot. I’m not an expert, but ... I think it is likely it is just one of those gravy shots like lightning strikes.
Did you catch the safari hunter from Beetlejuice over there on the right, in the shadows :)