# [Shakespeare Programming Language], 204 bytes

    A.Ajax,.Puck,.Act I:.Scene I:.[Exeunt][Enter Ajax and Puck]Ajax:Open mind.Puck:Open
    mind.Is I nicer than zero?If not,Let usScene V.Is you as big as I?If so,Let usAct I.You
    is zero.Scene V:.Puck:Speak thy.

[Try it online!][TIO-jz7j1czi]

[Shakespeare Programming Language]: https://github.com/TryItOnline/spl
[TIO-jz7j1czi]: https://tio.run/##TY5NCoMwEIWvMgeQHCCb4sJFoNCCIBRxEeO0TW0nYhLQXj51oouuZh5878dP75RKUb70UohrNGMhShNASVEbJOSnrRaMFLq2ooAzMAqaBmC6YyUvExJ8LA054U8qDwrIms0Wnprgi7M7qTuQC8UZA0S/tzRMri6C9tDbBx/FnHcHljeJ20ZYn1OOeY3cK@sJ9bh1rCKlHw "Shakespeare Programming Language – Try It Online"

Outputs the null character if input is not double speak, and outputs nothing (exits with error) if it is double speak.