ThSeeker,
per your pm, in that scenario, whoever oversold it will have to buy it back for whatever pps the shareholders are 'asking' for it.
Typically the bid gets raised substantially to pry those oversold shares out of the longs hands, as it's the only way to get them to sell them back.
After the short buys the oversold position back, it is then 'retired' and taken from the count. This goes on until there is an equilibrium of shares sold to actual OS, those lists are compared yet again to see what is held and what is available. This is done over the course of two weeks, there is a set time involved, and if the short still isn't covered, then the broker or broker dealer/mm can lose there trading license if they do not have the proper margin to 'let it ride'/
They will cover onthe way up, else lose the way they make their money.
RCCH seems to have that situation, more sold than what is actually available, that's why we see this cellar boxing, imo~