For me, the video is not about whether the call should have been made (you already said neither you nor your partners saw it.) It is this: what can I do the next time to be sure I see the illegal dead ball contact?
I think you and your partners were all doing their job well. Sometimes, stuff happens. The C, who might be in best position, can't see it because he is screened by other players...and has the back of the play. The lead is hustling to get ahead of the play, is properly looking back, but is not in any great position to see the off-ball contact. And you -- who might have the best view -- are watching the play up the sidelines.
Your original question, before the video was posted, was "What do you do when you feel there is a illegal dead ball contact, but you have not seen it?"
Even with this single video angle, I cannot say for sure that B2 used his forearm to send A1 to the ground. It probably happened...but the video does not "prove it."
As others have said....don't call what you didn't see. And don't sweat this one any more. You and your partners did all that is expected of you.
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