A London Marathon runner sacrificed his race time when he slowed to assist a fellow runner struggling to finish the race's final stretch.

As the BBC reports, Matthew Rees came to David Wyeth's aid just short of the finish line.

A clip of the moment shows Rees guiding Wyeth toward the end of the race, before a marathon volunteer comes to assist. Together they helped Wyeth finish out the race.

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Members of the Royal Family looked on as the pair helped the struggling runner reach the end of his race.

As a BBC commentator notes in the clip: "You can see Prince William and Prince Harry looking out just in disbelief at what they're seeing there-- the camaraderie, which is what the London Marathon...is all about."