yeah that was another rough moment F1 history, watch the Senna movie.
Watch how Senna watches his team mate almost lose his life.
(Countryman- Barrichello- not teammate).
Then knowing how the potential dangerousness of his car and drives anyways.
Then dies in qualifying. (actually, Ratzenberger died in qualifying, Senna died in the race itself).
I saw Senna about a week after it hit the theaters here. It was a decent movie, but lacked a lot of important stuff, IMO. I've been a formula one fan since the late 80's, and I vividly remember watching the race the morning of May 1. One thing that bothered me about the movie was that they used the wrong audio all the time. They tried to make the turbo-era cars sound like modern era cars. They also excluded the relationship between Senna and Prost. Not the rivalry, but the friendship that followed. He and Prost were actually very good friends right after Prost retired. Senna used to call him in the off-season to talk about where F1 was headed with the new technical regulations, etc. They even left out the audio from the formation lap of the San Marino GP where Senna wanted to say "hello to his good friend Alain" and that he missed him. Prost was in tears after Senna's accident.
What most people don't understand about Senna was that he was only as good as he was because of Prost. Prost was the best driver when Senna was coming up through the ranks and when they became teammates, Senna's sole focus was on destroying Prost. He didn't care about any other driver than Prost. You can see it in Senna's driving for both seasons he raced without Alain (1992 and 1994). He just wasn't at his best because he didn't have the one person on the track with him who drove him harder. Spa in 1992 should have been an easy win for him.
Whether he would have sparked a similar rivalry with Schumacher had he not been killed, I don't know. His driving in the first 3 races of 94 was uninspired as well. He'll always be remembered as the greatest of all time because he wasn't given the chance to fizzle out like some of the others who stayed past their prime (Mansell, Piquet, Schumacher, Hill).