what China did was sell US Treasury's b/c bond prices were an attractive trade. over the last several weeks they sold $103B.
as i see it,..the Chinese are market traders with a bit of gambling running through their veins,..they saw an opportunity to rid themselves of weighted treasury's and an opportunity to capture a great gain,..so they sold,...just like us option players do,..we see an opportunity and we place the trade,...
its just that their exiting Treasury's was a lot bigger move,..JMHO