I was there. It wasn't ENTIRELY chaos. Just for a short while, when the HK stars arrived in Estima's just beside the stage, those fucking idiots from the back pushed till the barrier, which is about 4-5 meters from the stage, was about to come down. They had bouncers/security/whatever to push back up the make-shift barriers. The MyFM DJ then told the crowd that if they don't control the pushing, the whole thing will be cancelled and the stars will be ushered back out of the area in their vehicles, even before the stars came down.
For those who hates Jay Chou, unfortunately, he stole the lime light. One wave of his hands to the crowd and the crowd screamed.
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Photo taken by Nikk. Brightened it up for easier viewing.
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Photo taken by Eric W.