Kill Them!

Even if the runs are short, the BPM is 170, so the base requirement is way beyond level 15. Rather than the runs themselves, the hardest part is preserving your gauge and stamina through the gallops before the runs even start.

Also, you charge your stamina from the start, do a gallop, then do another gallop from the second half, followed by a very short run, and finally a twist run at the end. After the next series is released, the perceived difficulty might be around low-mid for a level 16.

When I just watched it, I wondered why this was called top-tier when there are other high-level run songs... but there's a reason people rate it so high. It drains your stamina with small drills and then suddenly kills you with a run that requires quite a bit of leg strength, so even if you're not a local, you can fail instantly if you slip up. It feels like a mid-level 16, so if you're a local, just skip it. There are plenty of better run practice songs. However, since the only requirement is leg strength, it's one of the most manageable patterns among the top-tier ones.

Even if it's not long, 16-beat runs at 170 BPM don't belong in S15.

this could easily be a mid S16.