what is the main reason for the flawp batting at Sabina Park

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As on 13th March 2007, there was an opening game between Pakistan and host team West Indies. As usual Pakistani bowlers bowled pretty well in the beginnings but become a bit slugish in attack at the end on the west Indies Batting innings and got beaten by the West Indies batters. But what has stopped Pakistani strong batting line up to handle the West Indian bowling attack. They seems so vulnerable that it was pathetic to see the team nerves. SO how do you think or comment about this.