I will try to distill down the mortgage issue going on now. So mortgage lenders hedge against downside. They do this by shorting MBS (mortgage backed securities). Those instruments don't move much at all in terms of price (a handful of basis points).
An unintended consequence of the Fed buying truckloads of bonds is they are driving up the prices of those same MBSs the mortgage lenders shorted as a hedge. Instead of the prices fluctuating a few basis points, they are rising a full percent or two. This is causing large scale margin calls on those short positions. They have reached out to FINRA, the SEC and the FED to address this unintended consequence. This in effect can cascade to a mortgage crisis that would do the same type of damage to the market's health that the oil war is doing. There are only so many major shocks the market can take and continue to function.
Blazin did I explain that correctly?
Yes, the Fed has already back off purchases as the market has calmed.