Valerie Adams' coach is at a loss to explain his star thrower's silver medal in London.
Adams threw 20.70m which was 66cm behind the winner Nadzeya Ostapchuk of Belarus.
Adams' best throw was 54cm below her personal best.
Her Swiss coach Jean-Pierre Egger believed the issue was in her head.
"The problem was emotional. Everything had been going so good. We did have a little trouble with her back two weeks ago but 3-4 days after that she did her best power training and throwing.
"Suddenly something blocked today. I saw it on her face. I've never seen Valerie with such an Egyptian face [mummy].
"I went to her too late at the end and said 'Valerie, please smile'. She smiled, but I don't know, I must discuss what the problem was with her."
Egger says it did not reflect well in her technique.
"She was not aggressive enough. Her movement was not the same as her usual training. She did not have the intention to attack that she normally has. She was not dynamic enough driving off her leg; she was too slow."
Egger left his media audience with a muted and cryptic response on the performance of Ostapchuk.
"I would prefer to keep silent on this performance, if you understand me."
Egger still wanted to put Adams' performance into context.
"I said 'it's still a success'; our [Swiss] Roger Federer also got a silver medal [beaten by Andy Murray at the tennis]."
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