Thanks for your patience! The encounter has been deleted.
Normally, trying to delete the last Encounter of the Individual would delete the Individual. But this Individual had a social relationship (leopard mother-cub). The social relationship between this Individual and another was blocking the delete of the Individual and therefore, the deletion of the Encounter.
We’re going to fix it so that when this happens again, users will see a more accurate error message notifying them to remove the social relationship before deleting the Encounter.