Stephen and all,
I'm asking the same questions. Why ebb and flow, why in concert with moon phases? The only answer I can come up with is that despite being hyperdimensional, such entities are still bound by certain laws and limitations that require strategy and "tuning" for any actions on their part to have the intended outcome. After all, 3D is supposed to be a limited subset of 4D, just like a radio station operates on a narrow frequency inside a larger spectrum. To tune into that particular station requires optimal receiving and broadcasting conditions. It's known among radio enthusiasts that shortwave radio broadcasts come in clearer during the night due to better solar and atmospheric conditions. Likewise, certain conditions must make it easier for hyperdimensional beings to observe and manipulate the narrow 3D timeline frequency.
My speculation is in line with Kathy's, that the moon can act like a portal. It is, after all, the closest heavenly body to earth. From everything I've read regarding gravity, portals, earth grid, and so on -- it seems that any large gravitational body contains at the center a dimensional window, like a singularity that allows influx and outflux of energy between dimensions and densities. Any time two or more gravity fields are tugging in opposite directions at a single point in space, there is going to be stress placed upon the veil, prying open a dimensional doorway. Certain alignments between earth, moon, and sun compound this stress more so than at other times, presenting windows of 3D time when hyper-D forces have optimal viewing and manipulating conditions.
Another thing to take into account is that heavenly bodies appear to have some level of consciousness, and the energy outstreaming from their internal dimensional windows is filtered by this. So the moon may emit an energy imbued with some archetypal flavor that acts upon us in one way, whereas energy from other planets and stars have their own unique effects -- thus the basis of astrology. Moon is known to represent emotions and judgment (anyone into astrology, please correct me or add what you know about the moon as I'm no expert in astrology) - so certain moon phases are known to bias one toward heightened emotionality and lower judgment. Coupled with the dimensional portal idea, that would make such time periods opportune for attacks since offensive conditions are prime and defensive conditions are weakened.
"Why must we wait for an attack to pass or out-anticipate them to prevent it?" -- Well, I have confirmed that intending for protection can help tremendously, in addition to being aware or just patiently waiting for it to pass. But, why do we have to do anything? I guess it's because as long as we're in physicality, other beings can do certain things to us when they want unless we do something to prevent or counter it. Fourth density beings are supposed to be variably physical - enough so that the impact of their maneuvers are no less tangible than the impact of ordinary 3D hazards we deal with every day. Just one of the things that makes physicality interesting and 'fun'.
This has been a really weird week for me, and it keeps getting stranger. There's a total lunar eclipse on Oct 27th, and interestingly according to the Farmer's Almanac this moon is called "Full Hunter's Moon" - for what it's worth.
Acquiring fringe knowledge is like digging for diamonds in a mine field.