Long-time evolution of the NS velocity (top) and of the corresponding NS displacement (bottom) for models W15-6, W15-1, W15-2, L15-1, and L15-2. The displacement of the kicked NS from the coordinate center, although not taken into account in our simulations, can be estimated by time integration of the NS velocity. Within 3.3 s the NS in model W15-6 exceeds a velocity of 700 km s^-1 and continues to be accelerated at a modest rate. Note also that the NS velocities in models L15-1 and L15-2 have nearly reached their terminal values after 3 s. In all cases the NS shift relative to the coordinate center is negligibly small before the explosion takes off, and even in model W15-6 with its most extreme NS kick it is always dwarfed by the diameter of the shock wave and postshock ejecta, which expand with typically  ~10 000 km s^-1.