Earlier quoted context omitted.
> That's a different attack vector So you’re saying that the attack vector has… shifted.
No. The attack vector has changed to a different attack vector. In English, the word "the" in "the attack vector has shifted" is a definite article that refers to a single attack vector. If your car breaks down and you switch to using a different car, would you say "the car has shifted"? Speaking loosely, one might use "the attack vector has shifted" to mean something like "the possible attack vectors have changed",…
A vector here is the attack angle/direction. Of course I can shift my direction and then target another car.