https://quantifiableedges.com/a-rare-inverse-zweig-breadth-collapse-triggers/

and from Dan’s EW blog

“And although I won’t have the data point until Monday, I’m fairly confident that Friday ended beneath the .40 line making a negative event (in) only 10 days ( ) from above .615 to beneath .40.

One can say this was a “Zweig Breadth Thrust” event in reverse since it met the 10-day criteria! “