The High Court will only intervene in unterminated proceedings of a lower court in exceptional circumstances, such as where grave, irremediable injustice would occur. The proper procedure to challenge or set aside an order of a lower court must be by way of appeal or review. An urgent application seeking interim relief that is predicated upon an incompetent final order is itself incompetent. A rule nisi is not a final order but temporary relief pending proper determination of substantive rights. Supplementary affidavits cannot be filed without leave of the court. Where no special circumstances exist justifying intervention, the High Court must respect the independence and processes of lower courts in accordance with constitutional demands, and granting relief that would nullify or suspend a lower court's interim order would undermine that independence and be against public policy.