Because I'm a dunce.
Here's the best I can do...
At the very start of the song you will hear a run on the drums to begin, skip that... then the beat begins. There are two bass drum beats followed by a snare beat... the next beat you hear is the 'pop' snare. It actually follows the 4th beat of the measure... on the off beat.
So on the beat, with a 4 count.. it's BASS - BASS - SNARE - 4th beat is silent followed instantly by the 'pop' snare. What is unusual about it, and got my attention.. is that this is common but usually when used it's played on the same snare... possibly with a 'rim' shot for the 'pop'. Using a second snare radically changes the entire sound of the drum beat.