The shorts play their game of control with two strikes against them.
First is the cost of the stock they are shorting – interest.
Second is the cost of purchasing insurance – the purchase of call option.
Interesting comment by xfwangxfwan – So if Avnr would run up in price the short would agree to risk “infinity” to repurchase and cover their short position instead of limiting their loss risk with the purchase of calls …….. Son you need to read some good books on investing.