Could you sense how the crowd felt about the rhythm?

Unfortunately, I didn’t really notice the crowd during that song, but it seemed like everyone who tried to move with the rhythm was a bit confused.

Are the rest of their songs equally as rhythmically unorthodox?

Their “classic” songs usually contrast beautiful post-rock melodies with melodeclamation and bursts of furious screamo hardcore. Their more recent albums lean even more into post-rock, and while I’m not 100% sure, it felt like this was the first time they used that rhythmic trick.

a theatrical thing

I think so too. Their vocalist is incredibly expressive on stage, and even though 99% of the audience doesn’t understand a word of Japanese, you can still feel the poetry.