Starkiller felt a shock of recognition jolt through him. These weren't stormtroopers. They were him. Incomplete, and oddly- warped from true, but definitely him.
Vader gestured again, and the clones' eyes opened.
In them Starkiller saw nothing but hatred, anger, confusion, betrayal, madness, and loss.
Their glass cages shattered. Amniotic fluid boiled away. They pulled free from their cables and tubes and, with motions faltering at first but quickly growing stronger, climbed free from the wreckage.
Starkiller stood his ground as a circle of failed clones formed around him. Behind them Darth Vader nodded once.
The clones came forward in one overwhelming rush.
Taken from The Force Unleashed II (novelization)
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They also lacked in coordination:
From above came the sound of lightsabers activating, and he braced himself for another, more dangerous onslaught. These, the most normal looking of all the clones, spun, slashed, hacked, and stabbed at him from all sides, one-handed, two-handed, with all possible variations of lightsaber combat styles. Red-eyed and hate- filled, they fought each other, too, and the ones who had come before. There were no allies, just a sea of individuals.