It was 20:40 on a Saturday cooled by spring rain and Romain was ordering with his wife and 6-year-old son at the counter of the Starbucks café on the Avenue de l'Opera in the heart of Paris.
Just then he looked out the window and spotted a man attacking a passer-by on the sidewalk across the street.
"He had blood on his face and a blade in his right hand," Romain, 34, said.
"His victim dropped his kebab and was able to get away. Then the man crossed the street and started coming toward us."
"He approached calmly, a total contrast with the panic all around him, people were screaming and running," Romain said. "He had a beard, not very long, and was dressed normally. He didn't fit the stereotype," of a jihadist.
"He said "Allahu akbar" (God is greatest) twice, very quietly - it chilled the blood. We shut and locked the door, so he turned around," he said.
"A taxi stopped, and he stabbed through the window several times, which the driver was able to avoid, then he went on his way" toward the Rue Marsollier and a bustling district of theatres and restaurants, popular with both tourists and locals.
Romain called the emergency services at 20:46, one of the first to alert the police about the attack.
Two minutes later a nearby patrol of three officers was alerted by people fleeing the scene, sparking a frenzy of fear that quickly spread to nearby streets.
When they caught up with the attacker on the Rue Marsollier, he started walking towards them shouting "Shoot, shoot - I'm going to stab you!"
It's 20:56 when one of the officers tries twice to subdue the man with a Taser, without success.
One of his colleagues then draws his pistol and fires twice, striking the man in the chest. He drops the knife, its 10cm blade (four inches) broken.
At 21:24 the assailant is officially declared dead, but the surrounding area would remain cordoned off for hours by a massive police presence.
Behind the police lines, dozens of people gather: Some are tourists visibly alarmed and unsure of what is happening, others are just getting out of a show at the Bouffes Parisiens theatre.
The attacker is not carrying ID papers, but investigators learned later he was Khamzat A, a 20-year-old born in Chechnya who moved to France with his family as a child.
He did not have a criminal record, but was on watchlists for suspected radicalists who could pose a terror threat, and had been questioned by investigators just last year.
A 29-year-old man was killed during his stabbing spree and four other people were injured, two of them seriously.
Prime Minister Edouard Philippe said police had arrived just five minutes after being alerted, and the attacker was dead "less than nine minutes later".
"The speed of this reaction has obviously avoided a much higher toll," he said.
- FOLLOW News24 on Twitter