A forbidden category Zev associates with Carl's shelter encounter, apparently involving entities preserved inside memory simulations.
As Carl waits at Shepherd's House, the system AI blocks interference and protects the broadcast. Zev says the event obviously concerns Residuals and dismisses it as likely minor, but refuses to define the term because she is forbidden to do so.
She expects Carl to learn directly. Soon afterward, an elderly figure who should be an unaware memory ghost looks at Carl and calls him a crawler, providing the first observable clue to what a Residual may be.
A human silhouette remaining solid while surrounding memory ghosts fade into translucent echoes.
Residual is the hidden classification linking the sponsor network, the protected broadcast, and an aware figure inside a reconstructed memory.