Terket
the bladed machine looks down at its prey, hunched over it like a vulture. Then, it darts it's head forward. It's now gotten bored of you. The thing stands tall, almost ignoring you now, not caring if you're dead or not. However, it does do something before abandoning you. A wire or tube of sorts with a device on the end of it slithers to you, it the clips itself to the palm of your hand, tearing through any suit that may be there. It penetrates the skin but its painless, after a second or so it then detaches itself from your hand to the tall machine. The wire slithers back.
it then looks back down at you, it then opens its mouth. Not to scream, but to talk, in your tongue, in your voice. But it sounds coarse and rapier, only slightly, but just enough to unsettle anybody who can spot it
"the siren calls, it beckons to me, but the beast. The beast. It rages with fury to match the fire of man and its weapons. I stand in the middle, you should never have come here"
it then leaves you, towering over you and towards the tunnel you came from
the other soldier hears the noises in the vents draw nearer, but as you do, you hear a low rumble, followed by what you can only describe as whale calls, but just more perverted and distrusted, reaching high and low frequencies you can't hear. That may be why it sounds so incomplete.
the noise then silences as you hear large mechanical, spider like thuds move away from the bridge door