Did A Central Banker Just “Margin Call” All Other Central Banks’ Credibility?

“Did the BOJ’s out-of-the-blue reversal on its monetary stance which was refuted just weeks prior by Mr. Kuroda himself take place because after listening to the arguments, suggestions, as well as concerns, from the participants at Davos he concluded much like what the movie “Margin Call” depicted: It was all about to unravel? And if so: is this him deciding to be “first” and considered it his only choice?”