I think a lot of people are going to get burned come monday/tuesday.
No matter what happens when the stability ends, a lot of people will be burned.
However, there are $2mil on loan at bitfinex for long positions. If I were accumulating on a massive scale and saw that, I would squeeze those to get a better price.
How do you know those are for longs? Could be for shorts.
How would borrowing USD allow you to take a short position?
There are 1900ish BTC lent out to people with short positions.