Experiment B: When you bolt two magnets together when they repel each other, they fall at the same rate as anything else.
Explanation B: There is no outside force acting on the magnets, so they will fall at the exact same rate as a rock. The magnets are exerting great force on each other, but in Bushman's experiment there is no outside force that will cause the magnets to fall more slowly. The force present in the two-magnet system being dropped is akin to the force present in a system where two metal plates are bolted together and a bottle jack is placed between them and tensioned; it would fall at the same rate as a rock.
No matter the opposition of the magnets, Earth will still exert a force equal to the mass times the acceleration due to gravity. In the case of a magnet dropped down a pipe, an opposite force cancels some of the force due to Earth's gravity, causing the magnet to accelerate more slowly. In the case of two opposing magnets dropped from a height, there is no outside force and the magnets will accelerate and fall at the expected rate.
Magnetism and gravity are entirely independent.
Trevor