As far as I know, when some big company or organization tries to enter the Bitcoin market it crashes down to give them a better opportunity to accumulate Bitcoin at a low price. This is pure manipulation but this has happened before.
Anytime you say…
This goes beyond anytime as sometimes, the motive could be to buy. With big companies in the picture, your expecting huge buys that could lead to a slight pump in price with a higher demand of bitcoin.
If the reverse is the case where you have them selling, there you could talk about a slight dump.
I tried to put half of my order in advance and keep half in hand in case it dips down more i will have some left in my hand to lower my average. My order is around the 20k level and if the price crash further down i will not buy any more until it touches 15k which won't happens i think. Actually, it doesn't matter what i think i just made some planning for my investment strategies and won't change it until there is some unusual scenario occurs.