Then we can agree to disagree. I don't think Hisoka would have done anything to revenge Gon. Unless seeing him die gruesomely would have pushed his own bloodlust over the edge - though in that case the rattleman next to him might have stopped him for the sake of passing the trial. I don't think he gives a shit about Gon as a person. He only foresees a good fighting opponent. However, a good fighting opponent is not someone who loses miserably under circumstances like that.