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"Walk Before You Run" is the 525th episode of Casualty and the 31st episode of the 20th series.

Synopsis

Nina uses her Army training to rescue a marathon runner trapped in a bog, prompting the frustrated technician to set her sights on becoming a paramedic. A first-aider at the race asks Comfort out on a date. Ellen receives further bad news and Selena grows uncomfortable under Nathan's watchful eye.

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