  We now have several observational examples of misaligned broken
protoplanetary discs, where the disc inner regions are strongly misaligned with
respect to the outer disc. Current models suggest that this disc structure can
be generated with an internal misaligned companion (stellar or planetary), but
the occurrence rate of these currently unobserved companions remains unknown.
Here we explore whether a strong misalignment between the inner and outer disc
can be formed without such a companion. We consider a disc that has an existing
gap --- essentially separating the disc into two regions --- and use a flyby to
disturb the discs, leading to a misalignment. Despite considering the most
optimistic parameters for this scenario, we find maximum misalignments between
the inner and outer disc of $\sim$45$^{\circ}$ and that these misalignments are
short-lived. We thus conclude that the currently observed misaligned discs must
harbour internal, misaligned companions.
