Buy S&P Futures @ 1870- invalid/ win at higher risk

Buy S&P Futures @ 1870 if it stays above & goes higher, for 30 minutes expiration

Result: invalid/ win at higher risk

S&P Futures dropped below 1870 therefore signal is invalid
Although it tried to stay above 1870 & expired slightly above 1870 at 10:30am EDT, it couldn't go higher above 1871 & dropped more later, avoid selling below 1870