The correction already reached its first objective which is $15,700 which is just a Fibonacci level same as the recent top.    Any fright between those two prices is just the audience perception, there is nothing negative in the price yet to really justify a negative view.
If anything every pullback is a positive so long as it remains regular and stable within a larger trend and 20 to 15k is broadly just an adjustment area.    Thats a big gap in pricing in theory but also relative to the growth in price, speed and volume its reasonable.    

  Every day stocks trade the market makers and speculators reference previous movements, daily weekly monthly and if done similarly with bitcoin this wide range we have now is just normal action.   It may alter, maybe people get too worried I dont know but at present its still normal.   I also imagine Xmas has some effect even though BTC is global, this is just my personal guess on this time of year and I would say the same for Chinese New Year