Having claimed silver behind elder brother Alastair at Rio 2016, Jonny Brownlee appeared set to clinch the world title as he led the Grand Final with 700 metres to go in the sweltering heat of Cozumel, Mexico.
But it was at that point the Briton's legs began to give out, Jonny Brownlee weaving along the road on the run to the finish before appearing to come to a stop.
However, Alastair Brownlee caught up with him and refused to allow his younger sibling not to finish the race, putting Jonny's arm over his shoulder and pulling him to the finish line.
