If you want to prove it, you'll have to do it by asking the witness how much of the conversation was heard, just what was said, and leave the legal effect of it for the Court to determine.
Mason shrugged his shoulders and said, I have no further questions of the witness.
Shoemaker hesitated as though debating the advisability of asking further questions on re-direct, then shook his head and said, The witness is excused! He...