ES1!6424.75 tested the low 6400s in the overnight session. The 6400 area happens to be the mid BB, so a pause here is normal. Keep in mind we're coming off a divergent double top on the Dow and the lifetime resistance line on the SPX6411.37. In our view, the downside hasn't truly started yet, and a minimum 10% initial drop from the top would be typical before discussing a multi-day or multi-week retracement bounce.

ES resistance levels: 6433-6436,6456-6459,6475-6480
ES support levels: 6415-6417,6402-6405,6389-6393

As noted, it's plausible to see new lows below the ON low during RTH. If 6389–6393 is tested in the morning session, odds favor a good intraday bounce from there. Conversely, an early test of 6456-6459 will likely meet stiff resistance, and an intraday downside reversal is likely if that test happens in the first half of the session.