Yeah I love Devilman Crybaby deeply (it’s one of my favourite anime of all time), but good god it can be hard to watch. While I love it to bits I don’t think I’m going to sit down and rewatch it for a very long time (if ever) simply because of scenes like the one with the runners you describe and the club scene in the first episode. The show is hyper-violent and brutal to the extreme, but in Devilman Crybaby that off-putting, purposefully disturbing and upsetting ultra-violence actually works in its favour. It’s rare that a piece of media can be that violent and deeply upsetting while still being engaging and impactful.

Yeah it just happens. Like no real build up, you just get the general feeling that something might be off this episode and then... yeah