The binding legal principles established by the majority are: (1) On evaluation of expert medical evidence: Courts must apply the Linksfield test, which requires assessment of whether expert opinions are founded on logical reasoning, rather than immersing themselves in scientific detail or applying scientific standards of proof. The question is where the balance of probabilities lies on a review of all evidence. Expert evidence that is logically reasoned and not contradicted by acceptable contrary evidence should be accepted even if based on emerging research not yet universally accepted. (2) On causation in medical negligence cases involving omissions: The "but-for" test applies but is not inflexible. Where an omission to provide appropriate treatment within a critical timeframe denies a patient a substantial probability of recovery (here 64%), causation is established. The requisite causal link exists where the patient would probably have recovered but for the failure to provide appropriate urgent treatment. (3) On wrongfulness and the constitutional right to emergency medical treatment: Section 27(3) of the Constitution requires that appropriate remedial treatment aligned to the medical emergency must be given promptly and not frustrated by bureaucratic requirements or rigid adherence to protocols. "Emergency medical treatment" means not just admission to hospital or any treatment, but the appropriate urgent intervention required by the specific medical condition. Where appropriate remedial treatment is available (equipment, personnel, facilities), necessary, and could avert the harm, failure to provide it constitutes wrongful conduct. Constructive refusal of emergency treatment occurs when the system fails to provide necessary and available appropriate treatment without reasonable explanation. (4) On negligence in emergency medical care: Medical personnel are negligent when they fail to take reasonable steps that would be taken by a reasonable medical practitioner to guard against foreseeable harm. Where it is generally known that a condition requires urgent treatment, that specialized facilities are available, and that delay may cause permanent harm, routing a patient through non-specialized facilities based on rigid protocol adherence rather than directly to the specialized unit constitutes negligence. Healthcare institutions have a duty to ensure personnel are aware that protocols are not inflexible in emergencies and that direct referral to specialized units should occur in urgent cases. The failure to establish such flexibility in emergency protocols is itself negligent.