The beat the song is built on is one bar, played through bars 1-21 and 64-79 -- 21% of every bar the kit plays. This one moves around more than most: the beat is where to start, not the whole job.
It is played on hi-hat and kick, counted in thirty-second notes. On its own it scores 65 out of 100 -- demanding -- and the thing that decides that is the speed of the hand keeping time.
The whole song is 70 out of 100, so the beat is most of what the song asks for. Get it clean and the rest follows.
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 83 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 83, 98, 113 and 128 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 and kick, in 4/4 at 128 BPM, counted in thirty-second notes. It is written out above, and it covers 21% of the bars the kit plays.
Bars 1-21 and 64-79.
65 out of 100 on its own -- demanding. The song as a whole is 70 out of 100: demanding, mostly on how fine the subdivision is.