South Africa will be smelling blood as their scene-setting opening clash of the Rugby World Cup draws near.

Years of sure-footed All Black planning, the underpinning to some brilliant displays, has given way to nervy World Cup decision-making in the face of players going past their prime, and serious injuries.

Luke Jacobson's bizarre World Cup has hardly painted Steve Hansen's All Blacks in their most assured light, and it also reveal the scary truth about concussion in sport.

Jacobson would not have started against the Springboks in Yokohama on Saturday night but he was a bench prospect.

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His withdrawal from

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