IMO, there could be a flash crash that brings silver back down into the $20's but there may not be much physical available.
.......or it is possible that it could still be available at a "flash crash" sale of the $20's (mid $20's for example) but at a very high premium since a LCS is not going to take a loss of that amount with spot dropping that quickly. I suspect that if a silver "flash crash" of the $20's (mid $20's for example) did happen and a person was quick enough to act on it, then I suspect that dealers would just withhold inventory by taking it out of the display case and putting it away in the safe until the spot price recovers and the buyer who was quick on the "buying" trigger finger will end up "shooting blanks" and getting no physical silver at the "flash crash" sale.