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"I think we played with fire. I didn't like the attitude in the end. I didn't like the body language. It was not what the occasion needed."

Their body language and demeanour was also criticised, with Lewis' carefree approach lending itself to accusations of players not caring enough about the results.

It doesn't fidget much or use a lot of body language.

By hearing a victim's story in this way, the idea is it would make them conscious about subtleties such as body language and how they respond, which can influence a survivor's willingness to talk openly.

To test what was going on in these interactions, Waal compared how body language changed between pairs of chimpanzees who had recently fought and others who had not.