This scene appears to have been completed, and includes music. It also appears on the old Fleer trading cards, and so was likely cut from the film at the last minute.
See scene 281 of the Seventh Draft of Dune.
The full 7th draft script of Dune is available from www.duneinfo.com
281. INT. GREAT HALL - ARRAKEEN PALACE - DAY
...
PAUL
Gurney... I see Thufir Hawat among the
captives. Let him stand free.
GURNEY
My Lord?
PAUL
Let him stand free!
The Emperor turns nervously to Feyd, who passes a
golden dagger to Thufir.
FEYD
(to Thufir)
The antidote...
GURNEY
(gestures to Thufir)
Thufir. Come.
Thufir approaches Paul, concealing the knife. They
come face to face. The Emperor seems strangely
tense at this moment. Paul notices this. He looks
Thufir over.
PAUL (CONT'D)
(inner voice)
A knife....
(out loud)
In payment of the many years of service to
my family, you may know ask of me anything
you wish. Anything at all.
(quietly)
Do you need my life, old friend?
He turns his back on him.
PAUL (CONT'D)
(quiet)
It is yours.
Thufir's eyes grow sad and wide.
PAUL
I mean this, Thufir. If you are to
strike, do it now.
Thufir's hand rises, as Jessica gasps, but the old
Mentat pulls his heart plug out with a quick tearing
motion. Paul turns and catches him as he sags.
His head lolls back and he looks up to Paul
urgently.
THUFIR (CONT'D)
Three... generations... of you...
His breath escapes him and he is dead.
PAUL
(to the guards)
Carry this noble Atreides warrior away.
Do him all honor.
The guards do as they are instructed.
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