Eu acho que vi a cena que você está se referindo no que é chamado de "Third Stage Edition" do filme. A lista de versões alternativas do IMDB afirma:
A third version of "Dune", seen on KTVU in San Francisco in 1992, is the only one that edits together footage from both the theatrical and TV versions, putting back the violent scenes (such as the "heart sucking sequence") and theatrical versions of some scenes (such as Paul and Jessica running from a thumper).