Daniel Ricciardo admitted he could not believe what he was seeing in Alex Peroni's mammoth Monza Formula 3 crash, as fellow Formula 1 drivers agreed that lessons needed to be learned.
Peroni was launched into a series of terrifying rolls during Saturday's F3 race after striking a sausage kerb that had been placed in the run off area at Parabolica.
He landed upside down before flipping the right way up as he ended up on top of the tyre barriers.
The 19-year-old Australian was subsequently diagnosed with a fractured vertebra. He remained in hospital on Sunday morning and will have more scans later in the day.
Having watched the events unfold live on television, Ricciardo said that such an accident had previously been unthinkable.
"It's weird and you would never think that that kerb there would have such an impact," said Ricciardo.
"Unfortunately, sometimes you need something to happen so that you realise the consequences.
"I'd never looked at that kerb thinking of it as a danger or a threat.
"I don't know whether the kerb had lifted off the ground but I couldn't actually believe what I was seeing. I was actually happy to see it, because I know if they show a replay it means the driver is OK.
"So I'm glad he's OK but it's crazy. It's another lesson for us, so even if it seems like nothing - at those speeds you can just get a little turbulence under the car and it can take off."
Red Bull's Alex Albon reckoned the nature of the crash should prompt F1 to think more about how it deals with track limits and whether kerbs were the best solution.
"Even with Formula 1 I don't think we'd have had that kind of reaction because of how our cars are set up over bumps and stuff like that," he said. "But that's obviously a bit of a wake-up call.
"Luckily I don't think we have kerbs like that anywhere [else] we go to, and I'm sure we can redesign that. I'm surprised it's not one long one. It's basically a roadblock on the exit."
Carlos Sainz Jr added: "I didn't expect that a car could actually do that on that kerb, but it is something that we're going to take into account in the future.
"That kerb was meant to be there just for track limits not for an unsafe situation, and I think no one expected that.
"It's a lesson learned again for the F1 family that that kerb could create that kind of flip."
The kerb that Peroni struck was removed before final F1 practice, and world champion Lewis Hamilton suggested that the best solution for Parabolica would be grass and gravel.
"It was much better when it was grass and gravel on the exit there because I remember you used to come into that corner and you were a bit nervous of going in too deep because you might end up in the wall," explained the Mercedes driver.
"The grass would pull you out wide and you'd pay the price for pushing beyond the limit. So now you can go beyond the limit and that's - for me - the biggest problem with all these run-off areas that are Tarmac now.
"We didn't need to be consulted about the kerb. It's a band-aid on the issue of putting Tarmac there in the first place. I don't think they needed Tarmac round there."
But Nico Hulkenberg was not convinced that the Peroni crash should prompt a big reaction.
"I don't think it's time for a big debate," said the Renault driver.
"I think some things you have to think about and look at, but it's also for the driver and everyone to apply common sense and be reasonable, keep things controlled and it's fine.
"Of course sometimes an extreme situation brings extreme accidents."
Autosport has produced a standalone special magazine to celebrate our 70th birthday. All current print subscribers will receive a copy for free. To order your copy of the 196-page Autosport 70th Anniversary issue, please go to: autosport.com/autosport70th