meant the usual exit nodes were being watched by federal "sentinel" programs. The network was crawling with digital heat. To survive, he had to hop nodes every ten seconds, a manual "hot-swap" that required the precision of a surgeon. He watched the terminal. The screen glowed an icy blue: Handshake initiated.

Night crawling, in general, refers to the act of exploring or socializing at night, often in urban environments. Fu10, I'm assuming, might be a specific location or a community related to this lifestyle.

was the "Frequency Uplink" to the tenth server—a ghost node hidden deep within a major financial hub. "Night crawling" wasn’t about walking; it was the slang for deep-packet inspection under the cover of the city’s high-traffic hours, where a single hacker’s signature would be buried under millions of civilian transactions. The numbers 17, 18, and 19

) where unmarried men would secretly enter the rooms of young women at night to seek consensual sexual encounters. In modern contexts, it is sometimes used as a literary or archaic euphemism in anime or light novels.