Supply and demand... if you know a stock is heavily shorted and Martin Shkreli owns 70% of all the stock and tells his broker to turn off the borrowability, the

Supply and demand... if you know a stock is heavily shorted and Martin Shkreli owns 70% of all the stock and tells his broker to turn off the borrowability, then there's A) a lot less stock to short B) current shorts have to deliver C) less shares to buy when they cover what happen?