It’s interesting how high shutter speed he used, barely below 1/1000 even when not much movement is going on
It doesn’t look like much is going on, but he’s going to be rattling off a bunch of photos every second, in most cases, along with the fact he’s using long telephoto lenses, where shake is a real issue at the distances he’s shooting at, so a combination of lens length, aperture, ISO and shutter speed means shooting up to 1/5000th in order to get THAT shot. Those sort of shutter speeds would have been impossible with an SLR twenty years ago, and probably even with a DSLR maybe even ten years ago, and the new mirrorless cameras are allowing photographers to take extraordinary photos nowadays.