The boys chug through impossible time signatures, nearly dislocate a hip trying to headbang in 13/16, and use the scientific method to conduct an autopsy on the corpse of Meshuggah’s 2008 polyrhythmic endurance test, “Bleed.” News items and digressions include Yondr bags, Ghost, Tool, Iron Maiden, and whether locking up your phone is the new mosh pit etiquette.