Ferrari driver Charles Leclerc spoke of his disbelief that the Frenchman was able to extract himself from the wreckage.
"I saw it in my mirrors actually, so I saw it live," he said. "I went onto the radio straight away, I was very worried if you hear my radio messages, and just wanted to have the good news that Romain was okay.
"Arriving at turn nine, I still had no news and I could still see the fire so I started to worry a lot. The good thing is he jumped out of the car. It is incredible.
"If you see the crash, I struggled to believe it once he jumped out of the car so congratulations to the guys that are doing the safety of the cars."
Grosjean's countryman Pierre Gasly remarked it was the first time he had seen an incident such as the one that unfolded.
"Honestly, it was horrible," said the AlphaTauri driver. "Initially, I didn't know what had happened and when I saw the images I was shocked.
"For my generation, I have never seen things like this. I think it was more common in the past but it was really scary. When I saw Romain out of the car, I was happy to see him jumping out. I was just scared.
"I had no idea a Formula 1 car could break that way. Especially going through the barriers.
"The halo proved to be really working. I sent him a text during the red flags wishing him for a good recovery. What is most important is that he is fine. It was a really scary thing to see."
Williams driver George Russell hailed the role the halo played in ensuring Grosjean remained safe on impact as his car pierced the barrier.
"Had the halo not been there, I think we would have had an incredibly different outcome," suggested Russell.
"The way he walked away was incredible. I guess safety has moved along in recent years."
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.