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Figure 20.1: The thirty-second wall as a portcullis dropped across the corridor mid-delivery: the work is finished on the far side, but the waiting chair is already empty, and the failure is silent

A sequence diagram with three lanes, user, load balancer and agent server: the load balancer closes the quiet connection after about thirty seconds, the agent keeps working for minutes, its finished answer stops at the closed wall, and the user's retry starts a second run.
Figure 20.1 The thirty-second wall as a portcullis dropped across the corridor mid-delivery: the work is finished on the far side, but the waiting chair is already empty, and the failure is silent.