Sad story really but did you notice two weird points :
1) the jetsky itself, after this "terrible crash" show no visible damage 2) to crash a jetsky on a catamaran you really need to be a terrible driver...i mean, its not like you cant see whats coming your way on the sea...no tree or construction to hide other vehicules...
'The guide leading the tour group told the Gazette that he expressly told the tour group not to rent a jet-ski, as most of them could not drive well and many Chinese tourists had accidents with jet-skis in the past."