Keep in mind that there are many such 10 to 100 billion funds and they can move very fast if they have to. If the feeling is that the value of the USD is going to be lower in the near future they will divest and before you know it the threat becomes reality simply because it is predicated on a belief. Kill the belief and the actions will follow automatically. This could be the first and it could be the only or it could be the first of many.