The beat the song is built on is a 2-bar phrase, played through bars 16-18, 20-22 and 33-35, and 1 more place -- 22.2% 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 crash, ride, snare and kick, counted in sixteenth notes. On its own it scores 86 out of 100 -- hard -- and the thing that decides that is how many notes a second it asks for.
The whole song is 73 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 115 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 115, 138, 162, 185 and 209 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 crash, ride, snare and kick, in 8/4 at 209 BPM, counted in sixteenth notes. It is written out above, and it covers 22.2% of the bars the kit plays.
Bars 16-18, 20-22, 33-35 and 37-39. The time is kept on the kick and crashes to start with, and it changes 6 times over the song.
86 out of 100 on its own -- hard. The song as a whole is 73 out of 100: demanding, mostly on the independence between the hands and the feet.