Based on ICT concepts I have been learning, this is why the bull flag didn't pan out at the end of the market yesterday.
Review of NAS 8/30 - 9/2 in which we saw a daily range created prior to NFP and that range used to deliver price to a specific level while sweeping liquidity in the process.
SPX came down to Smart Money Buy Zone. There is a Smart Money Sell zone at 3506 also so if price decides to go back up, that is a good place to put a sell limit. I usually only do two hits to either zone.