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During a professional boxing match for the WBO world heavy weight title between Mike Riddick and Oliver Flower, Oliver Flower is seriously injured. It appears that the said injury was caused by a direct blow to his head before the end of the third round. Mike Riddick wins the world heavy weight title as a result of this knockout. On which ONE of the following defences will Mike Riddick be able to rely successfully in order to ward off a claim for damages based on the facts in the question above?