Dumoulin registered his stage-winning time early in the afternoon and had a considerable wait in the hot seat as the GC favourites tried to oust him. "I wondered if the Tour would continue or not", said Dumoulin.
Dumoulin (Giant-Alpecin) was full of confidence after a victory on stage nine, and the Dutchman came out on top again in the 37.5-kilometer route from Bourg-Saint-Andeol to La Caverne du Pont-d'Arc.
Froome himself was paid the bumper €450,000 prize, but prize money earned by racers is usually shared amongst the team who help lift them to the podium.
On Friday morning, Tour officials met with police, government, regional and security officials to discuss security arrangements, and Tour director Christian Prudhomme vowed the race would continue "in sobriety and with dignity". There was another minute of silence at the podium ceremony after the stage.
Largely thanks to the heroics of Chris Froome who won the Tour for a second time, Team Sky earned a total of €556,630 a year ago.
Few riders besides the top overall contenders can win both a big mountain stage and a time trial in the same Grand Tour.
Tour leader Chris Froome took time on all his major rivals for the general classification and now sits atop the leaderboard with minutes in hand.
Froome's compatriot Adam Yates (Orica-Bike Exchange) dropped from second to third, 2:45 off the pace after battling strong head and crosswinds.
But time gaps and places did not preoccupy most involved with the Tour in light of the circumstances.
Froome, who lives 20 minutes along the coast in Monaco, was in no mood to shout the odds after observing a minute's silence in his Yellow Jersey during the curtailed and subdued post-stage formalities.
Joining the overall leader and stage victor in the only ceremony held after Friday's time trial (organizers did not hold the usual separate jersey presentations) were Yates, in the best young rider white jersey; Belgian Thomas De Gendt (Lotto-Soudal) in the polka dot top climber jersey; and Slovakian Peter Sagan (Tinkoff) in the green points jersey.
Later, Froome and Dumoulin spoke with outward emotion.
Yesterday's 13th stage of the Tour de France cycling classic went ahead amid heightened security, despite the terror attack which killed at least 84 people in Nice on Thursday. Our thoughts are with everyone, and the families in Nice.
It was just such a tough time trial and with the wind thrown in, I don't think anyone could say that they particularly enjoyed that experience. To see the promenade with all the dead bodies and the horrific scenes is devastating.
Froome had increased his overall race lead as a result of the verdict but his time trial performance today saw him surge further clear as several of his nearest rivals struggled.
Speaking to French TV, the 2013 and 2015 champion said: "I told myself, 'I don't have a bike and my auto is five minutes behind with another bike - it's too far away, I'm going to run a bit".
"I went a bit out of focus this morning, which is normal when you hear about these awful things happening, just a few hundred kilometres away from here", Dumoulin said. "We're going to try everything we can".