Whether it was down to no recognition, the patrolling vehicle not having access to the necessary files or Marcus not even existing in this timeline... What mattered was the end result and it responded as it would have done with any other valid target.
Like a huge, mechanised centaur, the towering Hunter-Killer loomed above as it crunched over concrete and human bones. In some ways, it was a personified allegory for Skynet, itself and had likely evolved from the much smaller T-1 concepts which Elizabeth had activated upon her own Skynet's initial activation.
Marcus had only moments to leap behind the available cover before those turrets erupted with lethal eruptions of energy beams, slicing through the air at the instantaneous speed of light. Floodlights swept over the ground as that what passed for its box-like head moved slowly in his direction.
The thing looked big enough and strong enough to simply bulldoze through anything in its path. It didn't care. It was determined, ruthless and... Slow.
Which meant it had no awareness of the figure in ragged clothing out-flanking it from the rear and leaping down from the top of a nearby building. Initially, it didn't react, but she was quickly doing... Something and the sound of a buzzing saw could just about be heard vibrating against metal. Turrets slewed quickly, detecting a security breach, but whatever she was mysteriously doing to it...
And the great metal beast suddenly went silent, powering down. From where she had mounted it, flashes of blue light could be seen, but from precisely what, was unclear.