“Why does it shake? The body, the body, the body,” intones Joe Casey on Protomartyr’s first single from the forthcoming The Agent Intellect. It’s entirely rhetorical, the titular question he asks. The band does what they can to rattle some truths out of the questions they provoke, using their post-punk influences to devastating results. Why does it shake? Out of fear. Excitement. Joy. Sadness. It’s a primal reaction, something Protomartyr is able to convey with astonishing ease.