waving hands in the face of a defender

[Ang]

NF rules. I saw this on the weekend and want to bring this up for discussion/feedback. Team A is being pressed. A1 releases downcourt and is about to receive a pass from A2. B1 is running back trying to cover A1. B1 raises his hands over his head, does not turn back to see the ball and screens the opponent. The pass hits B2's extended hands. (Much like a pass interference call in football, the defender had no clue where the ball was) B2 DOES NOT WAVE his hands in the eyes of the A1. The Official calls an unsportsmnanlike Technical Foul on B1. Is it the right call or was it a good defensive play?

Thanks

Ang

Ontario,
Canada