On the evening the storm rolled in, power grids blinked and faltered. A flood of malformed packets began crawling across the city's backbone like ants disturbed. Devices tried to be heard at once, and the queues jammed. Critical messages — heart-rate spikes flagged by a clinic on the riverbank, a ferry reporting engine sputter, a research buoy sending rising-wave readings — found themselves stuck behind trivial retransmission storms and looping devices that had forgotten the polite rules of networking.