But eyewitnesses said a security guard was killed while trying to fight off the bomber.

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Two other British nationals, a Norwegian, two police officers and a security guard were also hurt in the fire fight, he added.

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You end up constantly on guard, with your adrenaline pumping to the fight or flight responders in your brain, leaving your best intellectual power untapped and unavailable.

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Munroe's defence was weak by the latter stages of the fight as Nishioka's jab continued to break his guard but despite some more desperate moments for the Briton, he held on until the final bell.

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