Kolkata, 16/11: One is an absolute beast when it comes to knockout matches in ICC ODI World Cup, slaying opponents without mercy. Another is like a rabbit caught in the headlights in such do-or-die games, even earning the moniker ‘chokers’ much to their dislike. And these two will collide in the second semifinal here on Thursday with five-time champions Australia confident of heaping more misery on a ‘nervous’ South Africa.