The video shows an visibly shaken young man leading the haka, trembling as he struggles to make it through the performance, at times almost overcome by grief.
"This is one of the most heartbreaking things I have ever seen," one YouTube commenter said.
Another said it embodied the power of a haka calling it an "amazing show of respect".
Others thanked those who had shared such passion and passion with one passing on "love, kindness and strength to everyone who needs it today.".
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