All I can say about this topic is that I found a new version of Dune movie. There are the same actors and actress, the same background but no scene seems to be as in the Lynch's movie. Actually, I found it in a Dune special collection, that contained also a second film directed in 1984 by Alan Smythee (it sounds like the 2 movies were made together) that is 180' instead of Lynch's 137'. It seems there is a part where Thufir was killed, but I have to see it again to tell you rightly. Ah, I'm from Italy, that movie wasn't never released in my country before, and it's fully in english language, even with italians subtitles.