The "strange nature" of the suit
In his book THE AGE OF SHAKESPEARE, Professor Kermode wrote of the trial or court scene: "The trial is folklore, and the judgment comes from a folklore lawyer, but the issues are real enough." Therefore, the scene is exciting. Further review, I think, allows one to suggest that only Shylock, Antonio and Portia make it so stimulating. The Duke gives us a clue regarding why he is allowing the case to be presented: "The world thinks, and I think so too, / That thou but lead'st this fashion of thy malice / To the last hour of act, and then 'tis thought / Thou'lt show thy mercy and remorse more strange / Than is thy strange and apparent cruelty"(4.1.16-20). That is, he hopes that the proceedings will resolve, at least in part, the conflict between Antonio and Shylock. When this is not happening, he turns things over to Portia. Her "the Venetian law / Cannot impugn you as you do proceed"(4.1.180-1), is one of the "thousand raw tricks"(3.4.77) that she warns us she may "practice." It also allows her famous "quality of mercy" speech that may be be intended to save the life of Shylock. Bassanio's "You shall not seal to such a bond for me!"(1.3.150) may mean simply that he regards the proposed terms as "bad form." Therefore, Shylock and Antonio alone regard the forfeiture to have any legal standing.