I never heard a such thing as an aim vector. Only the Sub machine gun Vector / I think u must b talkin about hit markers. the little X that comes out then fades away. Its went u hurt some 1 or stun/flash some1. If u keep shooting at a person, the hit markers will fade until the person is ded
Obviously he doesnt speak english or he doesnt type/speak well. -.- Aim VectorZ is part of the aimbot feature, so obviously is for aiming. I forgot how the hack works, but its under the aimbot section.