The only surprise here is that they've held out for so long before retaliating against yankee illegal trade practices against China. This is very telling that China has exhausted every effort to try and resolve this issue amicably. The US had always know what China is capable of doing. Yet, they doubled down to call their bluff and now we see a taste of what they can do.
They also sit on more than $6 trillion in foreign reserves which I assume they will wait for the right moment to dump.They will not be saving us during the next financial crisis created by the US.