The beat the song is built on is one bar, played through bars 19, 21 and 23-25, and 12 more places -- 25.6% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on hi-hat, snare and kick, counted in thirty-second notes. On its own it scores 78 out of 100 -- demanding -- and the thing that decides that is the speed of the hand keeping time.
The whole song is 89 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 76 BPM -- and adds the notes back over 5 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 76, 91, 107, 122 and 138 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 one-bar groove on hi-hat, snare and kick, in 4/4 at 138 BPM, counted in thirty-second notes. It is written out above, and it covers 25.6% of the bars the kit plays.
Bars 19, 21, 23-25 and 27-29, and 11 more places. The time is kept on the silence to start with, and it changes 7 times over the song.
78 out of 100 on its own -- demanding. The song as a whole is 89 out of 100. Hard, and what makes it hard is the independence between the hands and the feet.