Treachery is the way of the Sith.
As Dooku knelt on the floor with two blades at his throat, he can only recall that one lesson he has learnt from Darth Sidious.
Treachery is the way of the Sith.
It is very much pertinant to his situation, the one from which he can see no escape, not with the Chancellor urging Anakin to slit his throat as he is helpless on his knees.
Treachery is the way of the Sith.
Begging for his life will not spare him now. Darth Sidious is at least as merciless as he.
Treachery is the way of the Sith.
With the part of his consciousness that has been monitoring his surroundings throughout the battle, he searches out Obi-Wan Kenobi. He knows, now, that he will die anyway, but he feels no compunction to allow his death to further his Master's plans.
Treachery is the way of the Sith.
Count Dooku force-pushes some debris into Kenobi's side; enough to jerk him awake, but not free him from under the rubble. He will hear, but that is all. Even if Anakin remains the Chancellor's, this may be enough.
Treachery is the way of the Sith.
"Chancellor, please!" he gasps, pleading for his life, for those few crucial seconds to say what is needed. Sidious will grant them, because he does not realise he is betrayed himself. He raises his voice, checking on Kenobi's attention. He has it all.
"Have I not been your loyal apprentice, Darth Sidious?"
And the irony of his final statement allows him the ghost of a smile, a faint aristocratic sneer as he faces his doom.
Treachery is the way of the Sith. All the Sith.