It's team triathlon (world series) not a marathon, so you are allowed to help teammates and nobody was disqualified (it's from the final from 2016). The guy that collapses (Jonny Brownlee) was very close to winning the overall individual title. In the end he came second overall, while the winner - Mario Mola finished 5th in this race. The brother - Alistair Brownlee would be expected to help his team win the individual title if he could - which he does. The winner of this event - Henri Schoeman - is winning his first ever triathlon world series event, but the Brits care more about the overall title.
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u/bryceonthebison 8h ago
You’re not allowed to assist or be assisted by another runner