South Africa's Siya Kolisi had difficulty speaking immediately after his Springboks completed an emphatic 35-7 demolition of New Zealand's All Blacks in their final warmup before the Rugby World Cup.

It was not because he was choked up with emotion. He simply could not be heard above the cheers of South African supporters at London's Twickenham Stadium when he stepped up for his interview after the match.

"Thank you, thank you," he said as he waited for the noise to subside.