Assume there is a neutron star, it has a mass that is just short of what is required for it to collapse into a black hole. Now suppose there is an observer orbiting the neutron star. Assume that the neutron star and the observer are traveling at a very high velocity with respect to a second observer. To the second observer, the velocity of the neutron star is enough that its mass is increased beyond the critical limit at which it collapses into a black hole. Now, there is 2 observers looking at the same object, however the first observer sees a neutron star and the second sees a black hole. If the second observer throws an object into the black hole, it is irrecoverable once it crosses the event horizon, however the first observer seeing the neutron star could theoretically recover the object(not with current technology but it would be theoretically possible). I find this an interesting paradox assuming I'm not missing something that makes it impossible. Please give your thoughts on the subject.