the shorter, plays his game on a downtrend, as long as it keep falling he can gain profit, even if he sold at a lowest price than the last price at which he bought back, but he need then to buy back at a even lower price, it's better to buy back at , at least at the price of your last buy, otherwise you are only increasing the risk of losing
at some point he must go out of the market, if the downtrend is too strong, then the problem is that he can't enter anymore without losing money...
That doesn't make much sense . I believe what you are talking about is loss minimizing which is done when you know the prices of bitcoin or a stock is about to go down. In stocks shorting comes into play when typically a broker is involved, but how does it come into play with something like Bitcoin or Altcoin Trading ?