DIA - Short on the 15 minute

I noticed candles unable to break through resistance for several candles (wedge structure), plus double top compared to yesterdays (oct 18) chart. All markets trending down so I decided to take advantage here. $256.39 first target would be 50% fib retracement. Final target of $255. I bought at $257.70 with a stop loss @ 258.03 so 33 cent risk to gain $1.31 if I make my first target. Confirmation: stoichastics turning downwards.