As someone who follows aviation and flew the Flight Simulator quite a bit when young, I don't quite understand how it all happened.
The mechanics are clear, but aren't pilots trained _ad nauseam_ precisely against this kind of events? It read like this was two panicking guys shouting at each other.
By contrast, listening to the recording of the Hudson River landing, it was stunning just how eerily calm the pilots was there. You hear them opening the manual and reading from it IIRC!
I don't mean it like, they're dumb cos I watched a YouTube video, I just don't understand. Especially since, as the article claims, pitot tubes all freezing at the same time is somewhat common.