Kerim Okten / EPA

Blind Brazilian runner Terezinha Guilhermina and her guide Guilherme Soares de Santana react after crossing the finish line to win the Women's 100m T11 final at the Paralympic Games in London on Wednesday night. 

Blind or partially-sighted athletes are permitted to use a guide runner in Paralympic races, but the guide is never permitted to cross the finish line before the blind runner. At the 2012 Games, guides became eligible for medals for the first time.

 Video: Team USA guns for Oscar Pistorius in 100m showdown

24 hours earlier Guilhermina's bid for 400m glory was derailed when Soares de Santana tripped on the home straight, a moment captured in a series of heartbreaking images published on PhotoBlog.

But their despair was replaced by joy as Guilhermina took the 100m gold in a world record time of 12.01 seconds, adding to the 200m title she won on Sunday.

Suzanne Plunkett / Reuters

Kerim Okten / EPA

Julian Finney / Getty Images

Julian Finney / Getty Images

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• Iraq vet: 'Now it's time to win' at Paralympics
• Ex-Marine Angela Madsen on her journey from homelessness to Paralympics
• Nightly News: Representing Afghanistan at the Paralympic Games
• 'Meet the Superhumans': Paralympians burst onto world stage
• More images from the Paralympic Games on PhotoBlog

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Julian Finney / Getty Images

Terezinha Guilhermina of Brazil runs as her guide Guilherme Soares de Santana lies on the track after he fell in the Women's 400m - T12 Final on day 6 of the London 2012 Paralympic Games at Olympic Stadium on Sept. 4, in London, England.

Julian Finney / Getty Images

Assia El Hannouni of France wins gold in the Women's 400m - T12 Final on day 6 of the London 2012 Paralympic Games at Olympic Stadium on Sept. 4, in London, England.

Christopher Lee / Getty Images

Terezinha Guilhermina of Brazil and her guide Guilherme Soares de Santana lie on the track after falling in the Women's 400m - T12 Final on day 6 of the London 2012 Paralympic Games at Olympic Stadium on Sept. 4, in London, England.

Leon Neal / AFP - Getty Images

Brazil's Terezhina Guilhermina and her guide Guilherme Soares de Santana console each other after Soares de Santana fell just ahead of the finish line of the women's 400m T12 final at the Paralympic Games at the Olympic Park in east London, England on Sept. 4.

Update, September 6th: The night after these pictures were taken Terezinha Guilhermina and Guilherme Soares de Santana returned to the track, and this time their race had a much happier ending. Find out what happened when they competed in the 100m final.

Related content:

• Video: Team USA guns for Oscar Pistorius in 100m showdown 
• Oscar Pistorius sorry for timing, not content, of angry outburst at Paralympics
• Iraq vet: 'Now it's time to win' at Paralympics
• Ex-Marine Angela Madsen on her journey from homelessness to Paralympics
• Nightly News: Representing Afghanistan at the Paralympic Games
• 'Meet the Superhumans': Paralympians burst onto world stage
• More images from the Paralympic Games on PhotoBlog

Follow @NBCNewsPictures

Sign up for the NBCNews.com Photos Newsletter