Kamila Valieva: Russian skater in gold medal position in individual event

• Teenager given reprieve by Cas holds nerve after early slip
• Valieva 1.96 points clear with Thursday performance to come

At the start, a stumble. At the end, tears. In between, a brush with perfection.

And, amid the extraordinary tumult and torment of the past six days, Kamila Valieva did what she was trained to do: deliver when it matters.