that is exactly what I was thinking - to set up "unrealistic" buy orders to buy when something like this happen.
I'd not say it unrealistic, since a big sell could cause it regularly, especially if there's a low volume as mentioned above. I personally see it regularly on low market cap coins where people try to enter and exit asap because people swing trade from time to time. In addition to that, a problem with exchange liquidity also can cause this issue to happen.