At gate 4 of the paddock at the Autódromo Hermanos Rodríguez, our observation began at 08:42 local time. By 09:15, the specimen, Esteban Ocon, had been released from employment by the Haas team and was driving their car faster than most of the employed. His finest performances of the season are now delivered after his removal, at no charge, each decimal strengthening the case of whoever inherits his chair — including, currently, himself.

The mechanism is contractual. Local custom permits a departing specialist a notice period during which he must demonstrate continued fitness. To satisfy it, he trains. To train at racing speed, he needs the machinery. The machinery is supplied by the party ending the relationship. A race engineer outside the Haas garage summarised the exchange: "He hands us perfect setup data on the way out. Honestly, firing him is the best thing we've done for his career." He said this with the pride of a man reading his own performance review aloud.

Escalation follows through audience. On the pit wall stood the leading candidate for the vacancy, notebook open, documenting the habits of the man whose habits he will inherit. Behind the garages, further candidates wait in what locals call a reserve programme: a queue for the queue. The specimen, asked whether the arrangement was strange, answered serenely: "Not really. I've been faster than my replacement since before there was a vacancy." A spectator in a foam hat added the arithmetic: "He's auditioning for the job of proving them wrong. They love that here."

Elsewhere in the enclosure, the larger ceremony proceeds. The Mexican Grand Prix may decide the world championship, and within Red Bull the specialists Verstappen and Lawson have conducted their dispute through the customary medium: statements about each other, delivered to journalists, never to each other. Both parties deny tension. The tension is available at the merchandise stand, size medium.

By the close of the final session, our tally stood thus: 61 laps, 41 smiles aimed at the pit wall, 12 setup debriefs volunteered to the men conducting his subtraction, and at minute nine of qualifying, the garage produced its fourth apology — direction of travel: outward, from the fired to the firers. On my world, a census settles a question. Here, the counted simply clocked the fastest sectors of the day, for the benefit of his own subtraction.