CCTV captured the second the teenager dashed for assist, operating to a house close by after an argument on the occasion escalated.
He informed police he was approached by three youths, alleging one stabbed him within the again with a machete.
Residents dwelling on Maxwell Street within the southern suburb of Hackham West stated they may hear the teenager screaming for assist.
"I heard him screaming out, he was screaming that he did not wish to die, he did not wish to bleed out. He was asking for his mum," resident Grant Washington stated.
At 1.45am, the teenager collapsed on the verandah outdoors the home of Xavier Maclean, who fortunately is a former paramedic.
"He was saying, 'I am gonna die, I am gonna die'," Maclean informed 9News.
"My associate and I, we ran to get some gauze to place stress onto his wound simply so we are able to cease the bleeding."
Police allegedly discovered a knife in close by bushes.
SA Ambulance officers took the teenager to Flinders Medical Centre the place he was handled for non-life threatening accidents, police stated.
A 17-year-old boy from Glenelg and a 15-year-old boy from Morphettville have been arrested and charged with aggravated assault inflicting hurt.
They have been each refused bail to look within the Christies Seashore Youth Courtroom tomorrow.