Despite both athletes being hurt and upset, D'Agostino first encouraged Hamblin to get up and then when it was clear the American had injured her leg after they both resumed, the English-born Kiwi repaid the gesture by staying and urging her fellow competitor to carry on.
The runners finished their race and despite not qualifying they were later added to the final after both the New Zealand and United States teams made a protest.
Therefore, ten runners from this heat would go on to the final, for 18 competitors going for medals.
Oliver finished with a rank of 27th.
This completes the Rio schedule for Whanganui-affiliated athletes and coaches, the highlight of which was rower Rebecca Scown's silver medal with Genevieve Behrent in the women's coxless pairs final.
Scown then entered the women's eight final with fellow Whanganui competitor Kerri Gowler, finishing in fourth place.
Whanganui's Chris Harris and partner Robbie Manson, coached by Calvin Ferguson, were eliminated in the Men's double sculls semifinals and then finished fifth in the B Final.
It was a tough Olympics at the track cycling for coaches Dayle Cheatley and Jono Hamlin and the NZ team, who despite excellent preparations left the Rio velodrome with only one medal - the men's sprint silver by Ethan Mitchell, Sam Webster and Eddie Dawkins.
Legendary rowing coach Dick Tonks enjoyed one last hurray as his great protege Mahe Drysdale won a thrilling gold in the men's single scull final.
Tonks, a former silver medal winner and Wanganui Sports Hall of Famer, has now helped guide rowers to six Olympic golds in his career, yet went to Rio as Drysdale's independent coach after acrimoniously splitting with Rowing NZ last December.
Drysdale's second gold made Tonks the most successful NZ Olympic coach of all time.
