Understanding pre-market activities(gap up/down) and what happens right after the open

[Teruki 21]

Hello there,
I am trying to figure out when there is profit taking after the open when the stock gaped up and where there isn't.
Likewise, I'm trying to figure out when there is buying/squeeze after the open when the stock gaped down and where there isn't. 

For the squeeze, I believe this is the "rising devil" and it seems like it is more predictable. But for profit taking it seems more random to me but for the moderators it obviously isn't and they often warn us when there will likely be profit taking after the open. I believe the "falling angel" happens because of profit taking but according to Andrew's book it is mostly for low float stocks that are less than $10. I see gaped up stocks both sky locket after the open and go down a bit for profit taking before going up. Of course, sometimes the stock keeps going down for some other reason and we cannot predict everything but I am talking about what typically happens. Is there any guideline(s) for this? Something like "when a stock gaped up this much and the activities in the pre-market is like this, then it typically happens" etc.

As for the rising devil type of movement, I believe it happens when the stock gaped down and having a steady decline below the VWAP up to the open.
But I know only this one  as a typical movement (and the "falling angel" for low float stocks).

Thank you.