First, she would do her part to help push Flanagan through the finish line and give her a chance to finish first.
"She just seemed like she was going to be the sacrificial lamb, doing whatever she could to help ... then I just saw her keep going".
"Yeah, I'm in shock about that", she said.
The race was ultimately won by Desi Linden, with an unofficial time of 2:39:54 - more than 10 minutes off her personal record, notes Time Magazine. "I have the utmost respect for who they are as athletes and as people".
Marcel Hug of Switzerland earned his fifth wheelchair victory, and American Tatyana McFadden won the women's wheelchair race for the fifth time, pushing though puddles that sent the spray from their wheels into their eyes.
Watch the incident play out in the video at the top of the page.
Commonwealth Games Closing Ceremony
Actually wrecking a tradition that is so important. "We wanted athletes to be part of and enjoy the closing ceremony". But they put their best foot forward as that is what mattered and that is the motto of the Games - Share the dream.
'For me, it's the best conditions possible, ' Kawauchi said through an interpreter and with a wide smile.
Sportsmanship among the Americans was on full display during the race, particularly when Linden held back toward the beginning of the race to help Flanagan catch up to the pack after stopping at a port-a-potty.
Despite her early-race doubts - and even slowing down to wait for a fellow American runner that stopped to use the restroom - Linden was able to find her groove and clinch her first major marathon championship.
The race was undoubtedly one that Linden will never forget.
At the beginning of her Boston Marathon race, Desiree Linden was not sure if she had enough to make it to the finish line.
Although Canadian Krista Duchene finished third in 2:44:20, American women took seven of the top eight slots in the race, according to the Boston Athletic Association, which organizes the marathon. That was more than four minutes better than second-place finisher Sarah Sellers - one of seven Americans in the top 10 - but the slowest time for a women's victor in Boston since 1978.
Yuki Kawauchi splashed through the pelting rain, temperatures in the mid-30s and wind that gusted as high as 32 miles per hour to win the men's race, passing defending champion Geoffrey Kirui in Kenmore Square to earn Japan's first Boston title since 1987 and the $150,000 first prize.