An escape victor, is Who Successfully Defied the Gravity Pull of A Celestial Object by Adopting the Proper Escape Velocity. (Coudn't resist, sorry)
An escape vector is the trajectory that will get you out of the gravity well if you attain sufficient speed.
If you get too close to a large planetary body - a sun for example - then you get thrown out of superscuise because you get caught in the gravity well. There is a subtle proximity line around all such bodies and if you get too close then you will get a proximity warning and cockpit lights will start to flash red.