What made you so Hot? Aren't you interested to know where the troublemaker ship (US) had sailed in the South China Sea?
US officiers mentioned that USS Lanssen had only sailed within 12nm of Subi reef but on the above chart, it looked like that ship had also sailed near Mischief Reef and how near was not known.
There are many interested to know more details on the above incident. Cool down man!
The Evil Empire of today Modern world (USA) is going to create more provocations against China. So don't be surprised!