The binding legal principles established are: (1) A trial court must enter a plea of not guilty under s 272 of the Criminal Procedure and Evidence Act when in doubt about guilt, whether essential elements are admitted, or whether there is a valid defence, even if the accused pleads guilty. (2) Trial courts have a duty to investigate and explore potential defences that emerge from an accused's answers during canvassing of essential elements, particularly for unrepresented accused. (3) Courts must take the version of facts most favourable to an unrepresented accused. (4) Magistrates must comply with s 163A by informing accused of the right to legal representation and endorsing this fact on the record - failure to do so, coupled with other procedural irregularities, renders proceedings unsafe. (5) Courts should not seek to entrap unsophisticated, unrepresented accused into admitting legal concepts like dolus eventualis without proper explanation. (6) The defences of person (s 253) and necessity (s 263) must be properly considered when an accused acts to protect another from ongoing unlawful attack.