Anyway, regardless of how it is said, 'momentum is conserved' is like saying the truck moved because it has round wheels.
I would be more apt to believe that half the star was sucked into the 'black hole' and the remaining half was spinning round the vortex so fast that centrifugal force ejected it our past the Scharzhild (sp?) radius, possible at a much higher speed than it was entering.
You're welcome.
≤}B^)