That's why the sign says:She [Tridi] was nicked for contempt of court. There had already been injunctions imposed on the case she was protesting about. The rights established in the Penn and Mead case were entirely about the injustice of punishing a Jury for failure to give the judge a verdict he wanted.
The sign on the wall was general her protest was specific. It doesn't need to be any more complex than that.
... the opinion of the Court which established"The Right of Juries" to give their verdict according to their convictions."
Penn also ignored a judge's direction to stop preaching, and he carried on. As good as ignoring a court injunction.
The jury were sent to prison for ignoring the judge;s direction to find the defendant guilty.
... the recorder charged the jury to bring in a verdict of guilty. Four jurors dissented, and they were sent back to rethink their verdict. The jury then found Penn and the others guilty of “speaking in the street”, but refused to add the words "in an unlawful assembly". The magistrates refused to accept this, and ordered the jury to be "locked up without meat, drink, fire, and tobacco", while Penn called to them not to give up their rights as Englishmen.
The charge that unarmed worshippers had riotously broken the peace was absurd. Yet the result was that Penn and all twelve of the jury were sent to prison.
The jurors, released on a writ of habeas corpus, sued the mayor and recorder, winning their case before the Court of Common Pleas in a historic decision that conceded that judges "may try to open the eyes of the jurors, but not to lead them by the nose."
This Penn-Meade trial became famous and showed that the arbitrary and oppressive proceedings of the courts badly needed reform. It is a precedent to this day.
If you are sympathetic to the defendants defence, i.e their honestly held belief, you can acquit them. However if you do not share their honestly held belief, you are expected to give a verdict on the evidence alone amd ignore the defendants defence.