It was instinctual.
She hadn't planned to kill him.
Maybe wound him, but not kill.
But the events of the day had ensured that Lyra was hardly in a calm state.
0127's journal had made her realize certain truths that she and most of her kind had ignored for several years.
Coupled with the troublesome situation with the Relics, she was hardly in the best state to react properly to Alex's actions which was why his cold body now lay silent on the platform, devoid of life.
Letting out a sigh, she moved her free hand, utilizing weapon control to pry the double-edged sword from the dead body before instructing the Taskmasters behind her.
"Burn the body, far away from here. I'd rather not want a zombie corrupted by the whispers emerging around here."
The Taskmasters nodded in response after which she handed over the doubled-edged sword to the one who owned it before making her way back into the Archives.