B-side "Knock Knock" is the fuller club jam, focused on propulsion rather than its flipside's cheeky teases of melody. The song's crux is the forceful bass thud characterized by its title, like it's trying to pull the ground up from underneath with every hit. "Knock Knock" has a dreamy synth breakdown, and the moment it slams back into the main section with those pitched-down vocal samples it should be clear exactly which big-name producer is behind this particular slab of anonymous vinyl.
That Joy O(rbison) would want to separate his identity from these tracks (even after "Sicko Cell" blew up) doesn't feel like a publicity stunt, though the mystery certainly didn't hurt the track's universal appeal. Instead, considering the producer's move towards house—"Wade In," "Source Delight," "Ellipsis"—"Sicko Cell" feels like a one-off bout of dubstep-friendly regression in his current progression. I still don't know if it's genius or gimmick, but whatever it is, it works.