The discussion centers on the assumption that magnetic flux remains constant during the collapse of a star into a neutron star. It is clarified that while the total magnetic flux is conserved, its density increases significantly due to the star's reduced radius, concentrating the flux in a smaller volume. The high electrical conductivity of the neutron star allows magnetic field lines to "freeze" into the material, maintaining a strong magnetic field post-collapse. The conversation also touches on the dynamics of neutron stars, noting that they can become dynamos, generating intense magnetic fields limited by energy constraints. Overall, the magnetic flux's behavior during this process is complex, influenced by the star's conductivity and the conservation of flux principles.