For the defence of self-defence to succeed under section 253 of the Criminal Law (Codification and Reform) Act, the court must consider the actual circumstances in which the accused found himself, including any stress or fear operating on his mind, and must avoid applying an "armchair approach" with the benefit of hindsight. When assessing whether force used was excessive, the court must take into account the heat of the moment and the real circumstances faced by the accused during the attack. In cases relying on circumstantial evidence, applying R v Blom principles, where the accused's version is reasonably possibly true and not excluded by the proved facts, guilt cannot be inferred and the accused must receive the benefit of the doubt. The mere production of an exhibit in terms of section 314 of the Criminal Procedure and Evidence Act does not prevent an accused from challenging that exhibit or mean the accused accepts all characteristics attributed to it by the prosecution.