Here is example of Account blowing in case of Big move during carry trade unwinding.
if you are unaware of BAD news and try to pick at SMA...you can blow account.
in chart shown price pass through all SMA and found support at last SMA2400 on H4, it also fall 300pip below H4 SMA2400 but quick pull-up.
After that price move well respecting all SMA.
If you maintain small account size which you can afford to loose..and withdraw profit above it and keep in safty fund, then you can save from Big blow. if you hold Big size account and dont use Stop...you can get Big blow.
When everything is falling...don't try to catch falling Knife.