Strangely enough, in Armageddon, Cyrax is able to pull his Pulse Blade out during a Fatality, while Sektor can't pull out his.
Cyrax used his Pulse Blade against Havik in the opening of Mortal Kombat: Armageddon.
The single Pulse Blade that Cyrax wields has the same attacks and animations as Shang Tsung's Straight Sword.
In Deadly Alliance, Cyrax’s Pulse Blade had a blue colored blade. In Armageddon, the blade was changed to green. This is likely a homage to the Star Wars films, where the main character Luke Skywalker has a blue lightsaber and then, in a later film, constructs a green one.
Cyrax's single pulse blade.
Sektor's double pulse blades.
Sektor's versus render showing him holding his Pulse Blades in Armageddon.
Cyrax's blue Pulse Blade in action in Deadly Alliance.