The beat the song is built on is one bar, played through bars 5-7, 9-11 and 13-15, and 2 more places -- 24.6% 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 ride, snare and kick, counted in sixteenth notes. On its own it scores 88 out of 100 -- hard -- and the thing that decides that is how many notes a second it asks for.
The whole song is 78 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 101 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 101, 121, 142, 162 and 183 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 ride, snare and kick, in 8/4 at 183 BPM, counted in sixteenth notes. It is written out above, and it covers 24.6% of the bars the kit plays.
Bars 5-7, 9-11, 13-15 and 17-19, and 1 more place. The time is kept on the silence to start with, and it changes 13 times over the song.
88 out of 100 on its own -- hard. The song as a whole is 78 out of 100: demanding, mostly on the independence between the hands and the feet.