Two questions:

#1>

If at position A an object only experiences the net gravity.

Than does this follow from that?

If we say that position A is a tiny distance ( say a Planck Length ) inside the event horizon of a black hole. If we then add a high gravity object ( Neutron Star or Quark Star ) on the outside of the event horizon ( say a Planck Length ).

Shouldn't the two opposing gravity sources reduce the net gravity of the object at point A? Effectively shifting the location of the event horizon. The object at point A could then be able to move through and outside of the original location of the event horizon without a need for FTL?

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#2>

Part A:

If the escape velocity is defined as the velocity needed to escape a given gravity with no further propulsion.

Than does it follow from that?

If one has additional propulsion than then there is a different escape velocity. If I have a constant propulsion I don't need to be going as fast initially in order still be able to escape the same gravity.

Part B:

If inside the event horizon is inescapable because the escape velocity is greater than the speed of light, and you can not go faster than the speed of light.

Than does it follow from part A that?

If an object has additional propulsion it's effective event horizon will be shifted. It would be slightly different than the object with no additional propulsion.