Terbrugge, a danger?

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This is what Cricket.com reported:
*South Africa in final as Terbrugge knocks Pakistan cold

COLOMBO, July 12 - Unheralded David Terbrugge caused a dramatic Pakistani collapse here on Wednesday to hand South Africa a seven-wicket victory and a place in the Singer Cup final against Sri Lanka.
The 23-year-old fast bowler from Gauteng claimed four wickets in only his second one-day game and wicketkeeper Mark Boucher snapped up five catches as Pakistan were shot out for 153. Terbrugge, making his first appearance in the tri-series and without an international wicket under his belt, struck in each of his first three overs at the Sinhalese sports club ground.*

Why do you think this happened?
Was it because of the Pakistan team’s poor batting or Terbrugge’s good bowling?

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Pakistan's lack of performance. Pakistan is a way much better team then Srilanka and South Africa. They didn't play well at all throughout the whole tournament. It wasn't because of Wasim Akram's abscence, it was because of the whole team's lack of peformance.