Sean Mann is a good guy and I'm really happy to see someone working one of his flutes so eloquently.
He really can work the call.
I honestly do believe that his white face, with moving white hands, poking through that open hole in the blind probably cancelled out some of the good calling. It looks like you guys shot plenty. I'd bet that they'd have decoyed in much better if the calling face was not protruding out of the blind like that.