In Karate Kid 1, Why should Larusso be disqualified?

  1. In Karate Kid 1, Why should Larusso be disqualified for his Krane Kick?
  2. Does the rule also apply to International Tournament or US only?
  3. If Larusso should be disqualified for his Krane Kick and the rule applies Internationally, Does that mean Dre and Cheng should also be disqualified in the 2010 reboot for their brutal moves?

https://youtube.com/watch?v=Pt6VzQ_0k_I

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