I have finshided the game and i have finshied the challenges and beaten the time except this one but this is the last one i havent beaten the time because i keep on getting killed or i finish it 2 seconds later so i need to know how you beat the time on this challenge

I have finshided the game and i have finshied the challenges and beaten the time except this one but this is the last one i havent beaten the time because i keep on getting killed or i finish it 2 seconds later so i need to know how you beat the time on this challenge
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http://forum.team17.co.uk/showthread.php?t=25083