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B1 can play defense and run into a screener that he doesn't see, provided he stops or attempts to change direction on making contact. It is a blind screen, intended to catch the opponent by surprise, and the contact is by rule incidental.
On the hard crash, the question is whether or not an assignor wants it called, as well as whtether you judge B1 to have attempted to stop. Another consideration is advantage/disadvantage - if the contact works to B's favor, you may feel it needs to be called. But by the book, B1 can make hard contact if he doesn't see the screen, then stop, and it is all incidental, regardless of whether or not A2 crashes.
As the coach of the screening team, my screen achieved its purpose. I don't want a foul called in most cases. I know that you will hear it from some coaches and most fans, but I want my players to be allowed to finish the play if I get an advantage from the blind screen. And I teach them to protect themselves, particularly in these cases where they can easily expect contact.
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