His life must have flashed before him when the Mercedes-Benz W154 of team-mate Manfred von Brauchitsch burst into flame during its final scheduled stop.
Suddenly the choreographed order that he had so craved – in a letter Seaman likened the mechanics to a PT squad at the Royal Tournament – descended into chaos as men in white overalls dashed for fire extinguishers, and their lives.
But it was not shock that broke across Seaman’s face, rather, bewilderment, followed by realisation: I can win.
Car wheeled back, he nudged through the milling throng – smoke and foam onto the concrete apron – and accelerated away.
He did not, as legend suggests, await instruction from team manager Alfred Neubauer – whose wave of his flag was understandably distracted, half-hearted and retrospective – and only 5-10sec had been lost.
The most politically charged GP victory lay six laps’ distant.
It had been a difficult second season for Seaman with Daimler-Benz AG.
His first had been busy as he learned the trade in its hugely powerful W125 of 1937 and he impressed team members with not only his calm collection and skill but also his focus and engineering grasp.
They liked him. And he liked them.
But that was no longer enough by 1938.
Hitler’s boastful aggrandisement was gathering insidious pace, force and volume and the presence of an Englishman in Germany’s most high-profile sporting team – how else was he expected to win, the poor fellow? – was propaganda enough without risking him having actually win something.
A radical change of formula had put even the mighty Mercedes-Benz on the logistical back foot: just two of its new 3-litre V12s were ready for Caracciola and Lang in time for April’s Pau GP.
That they were beaten sensationally by a stripped-down Delahaye V12 sports car driven by René Dreyfus suggests that they weren’t entirely prepared at that.
Four were sent to May’s Tripoli GP but the team was limited to an entry of three. When its proposal that the remainder be run in British Racing Green – which would have been something given the nationalistic machinations – was rejected, Seaman was benched.
Jealous French officials capped Mercedes-Benz at three also for its GP de l’ACF at Reims in June. Seaman was fastest during Friday practice but did not race.
The dam burst at the Nürburgring in late July: seven W154s – four race cars and three T-cars – were presented and Seaman was given his head while newcomer Walter Baümer was this time held in reserve.
Seaman chipped off the rust while qualifying third – albeit a second per mile slower than the aggressive von Brauchitsch – and lined up on the outside of the front row.
His Nazi salute, when it came, sagged somewhat from the elbow
He was ahead of Caracciola, who was suffering from a stomach complaint, and Tazio Nuvolari, who was contesting his first race as a contracted Auto Union driver in its brand-new D-type.
The start was ragged and Lang led by 9sec at the end of the first lap. Seaman reduced that to 6sec next time around but von Brauchitsch was catching them both.
Lang pitted because of a fouled plug after three laps and von Brauchitsch took the lead: the perfect Nazi script, for aristocratic Manfred was nephew to Hitler’s recently appointed Commander-in-chief.
Seaman, sufficiently ambitious to risk and eventually wreck his disapproving family’s dynamic but a team player nevertheless, knew his place.
Not that von Brauchitsch was convinced: at his first stop he complained to Neubauer about the Englishman’s unnerving ‘steady’ presence that had included his setting the race’s fastest lap.
Poor Neubauer was also copping it in the ear from Nazi officials blaming oil dropped by a Mercedes-Benz for Nuvolari’s damaging spin on the opening lap.
The 350,000 spectators were not to know it but the 22 laps – more than 500km – through echoing Wagnerian forest comprised half, perhaps less, of the battle being enacted.
Von Brauchitsch has been stationary for 15sec – long enough to fit new rear Continentals as well as to slug in 80 gallons of exotic brew – when Seaman rolled in; easier on his rubber, he was considering fuel only at this his second stop.
So it was going to be close – and a mechanic became careless in his understandable haste.
Burly Neubauer arm-rolled a leaping von Brauchitsch from his blast furnace of a cockpit and beat at the flames with that flag. A crowd peering over railings atop the garages scattered.
That choreographed order was restored impressively quickly and the charred but not yet chastened von Brauchitsch climbed bravely back in, to thunderous cheers.
His moment – and Seaman for that matter – had gone, however, and Manfred would return to the pits on foot brandishing the steering wheel that he claimed had become detached and caused him to crash at 120mph.
Now with a huge lead over Lang, who had relinquished his own in order to assume Caracciola’s better-placed car, Seaman was alone with as many thoughts as 485bhp on hard, skinny tyres would allow at the be-hedged Nürburgring.
There was much to mull: the achieving of a lifetime’s ambition; his fiancée, whom he had met just weeks before and who was the Anglophile teenage daughter of the boss of BMW; and the ramifications of that as well as victory in the most highly charged race of the year.
He probably guessed that the clouds of war would soon occlude his zenith.
His Nazi salute, when it came, sagged somewhat from the elbow – in contrast to those thrusting beseechingly skywards beside him – as he realised that winning for the love of your machine had been replaced by the honour of one’s country.
His wish that he’d been driving a British car was wistful rather than flagrantly nationalistic. Simply, it would have made things so much simpler.