There have been touching scenes at the world athletics championships in Doha, Braima Suncar Dabo assisting rival Jonathan Busby over the line during the 5000m heats.
Aruba's Busby was struggling and clearly exhausted with 200m left, and with Guinea-Bissau's Dabo out of contention, he opted to sacrifice his own race to help his competitor finish.
Busby collapsed again right after crossing the line - but not after a quick glance at his stopwatch. He was later taken away in a wheelchair.
Both runners finished more than five minutes behind Ethiopian winner Selemon Barega in a time of 13m 24.69s. Busby and Dabo came home in around 18m 10s.
"The main objective was to represent my country as well as possible, and I'm happy I could help the other guy," Dabo told Reuters.
"I saw he was not running in the right way, he was leaning, I realised he wasn't going to finish.
"I knew I wasn't going to beat my personal record, so when I realised that, it was better to go for the main aim, which was to finish the race. My thoughts were to help him finish, that is the point of the race."
Meanwhile, New Zealand had two athletes take part on the opening day, with Julia Ratcliffe competing in the women's hammer throw qualifying and Edward Osei-Nketia in the men's 100m heats.
Ratcliffe had a best throw of 70.45m, which was short of the qualifying target for the final, while Osei-Nketia was fifth in his heat in 10.24s, which wasn't enough to reach the next round.