Pek,
I took a look at the PA in the AH AFTER Oct 15 SDD
and at the PA for the RTH of Oct 16, (which was your example of a trade day after an SDD).
The Oct 15 AH action established a low around 2:30am, worked higher, good gap up at RTH open.
Then, as you have commented, after 10am, prices moved lower and Px actually undercut the AH low before establishing a strong trend higher.
Road map for today?
picture of chart attached.