Look at the current price movement of the S&P 500, it seems that it already hit the current resistance and it is currently retracing on its current support at 3400 points. You are lucky because you able to do shorting an hour ago. Actually I have long positions there in S&P when I bought it last july 31 when the breakout occurs. My plan there is to trend follow it and my exit plan is whenever the price will close below 20 ma which is the color red moving average in the chart and it seems that I will going to sell it if there will be another red candle. But for me there is nothing to worry about because it is normal to see retest and retracement in stocks and indices. Remember that there is no indices and stocks that are going straight up because the price are moving inside a box or triangle like a waves. In terms of the gapping down of the zoom, for me it is normal because last day it gap up and went high as $476 if I'm not mistaken.
In terms of the price of the bitcoin, for me this is different because it shows weakness after the breakdown. But the good thing is there is a wick in the support that telling that it bounce in that area where a lot of buyers are willing to purchase in that area. If the price managed to hold then expect that the trend will be a sideways but if the price pierce through support again then it only indicating that the trend snaps where in the trend already turning into bearish market.