Coincidental/accidental - I like that.
It should come as no surprise that daytraders are looking at different things than fund managers. The "swings" that daytraders are so fond of aren't even seen by most traders. And the timeframes that interest daytraders are far smaller than those that interest traders who focus on daily and weekly charts, much less the focuses of those who trade 5m intervals vs 15m intervals vs hourly intervals. And since everyone is focused on a different interval and timeframe, they to a large extent trade at cross-purposes to each other. Which is a chief reason why so many trades fail.
But the time eventually comes when the planets align and everyone just happens to be looking at the activity surrounding -- for example -- the previous day's high, or the previous week's high. They are all looking at the same thing in largely the same way and trading the same move. Everyone is on board, and the train takes off in a very impressive way. Those who are not aware of this dynamic may view it all as coincidence, but it is more accurately a phenomenon in which everybody in all timeframes is trading in the same direction.
I love those days.