The beat the song is built on is a 2-bar phrase, played through bars 18-20, 22-24 and 26-28, and 26 more places -- 31.6% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on ride, snare, mid tom and kick, counted in thirty-second notes. On its own it scores 60 out of 100 -- a step up -- and the thing that decides that is the independence between the hands and the feet.
The whole song is 73 out of 100, so the beat is not the hard part: what costs you is everything around it, the joins and the fills.
A part this hard is not learned by playing it slowly and hoping. The room opens it on its simplest reduction -- the timekeeper alone, at 104 BPM -- and adds the notes back over 4 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 104, 123, 141 and 160 BPM, and the gate at each one is 8 loops in a row with no wrong note and no wobble in the time.
PRACTISE THIS BEAT →A 2-bar phrase on ride, snare, mid tom and kick, in 4/4 at 160 BPM, counted in thirty-second notes. It is written out above, and it covers 31.6% of the bars the kit plays.
Bars 18-20, 22-24, 26-28 and 30-31, and 25 more places. The time is kept on the silence to start with, and it changes 31 times over the song.
60 out of 100 on its own -- a step up. The song as a whole is 73 out of 100: demanding, mostly on the independence between the hands and the feet.