The more the Fed has bonds in their balance sheet, the more fragile they are in an inflationary crisis. If inflation goes up and interest rates go up, the fed's

The more the Fed has bonds in their balance sheet, the more fragile they are in an inflationary crisis. If inflation goes up and interest rates go up, the fed's bonds go down in value. If the fed balance sheet becomes too much in the red, they need to print to make up the difference, which means more inflation.