the thing then morphed it's arm into a Directed plasma energy weapon (Plasma cannon.
"Let me make this clear, I didn't come for the company, they had sent me in to impersonate your ally, they wanted me to bring back the life form, all priorities rescinded. I have a different idea, I kill all of you, but not before you tell me where my target is, but you don't know and even if you did, you'd only try to warn the others, infecting you with the Xenomorphs was just a convenient way of killing you you see, I was told if it just looks like that stupid Weyland corp killed you no one would be the wiser, but since I have no other choice I must use my own weaponry to kill you, then I just detonate the ship, and no one would even notice your body was disintegrated and there's a plasma burn in the wall.
With that the Terminatrix fired it's blast of lethal energy.