I don't see why it would'nt go back up between $6 an $7
Because that price was being held up by all the over leveraged longs, who bought in during the preceding euphoria, that just all got smacked down.
All that cash is now in the mystery shorter's account. I doubt he is in a hurry to pump the price back up as he has 17k bitcoin to buy back below 6.45 before he can realise his profit.
I think this is also the case, although if replacement cash is injected by people who still believe in a higher long (this might be a very good time to buy, in fact), that shorter would have more pressure to act sooner rather than later wouldn't he?