軍師獻計 The Fatal Counsel
旨意上時辰、數目，與那先生判斷者毫髮不差。諕得那龍王魂飛魄散。少頃甦醒，對眾水族曰：「塵世上有此靈人，真個是能通天地理，卻不輸與他啊！」鰣軍師奏云：「大王放心。要贏他有何難處？臣有小計，管教滅那廝的口嘴。」龍王問計，軍師道：「行雨差了時辰，少些點數，就是那廝斷卦不準，怕不贏他？那時捽碎招牌，趕他跑路，果何難也？」龍王依他所奏，果不擔憂。旨意上时辰、数目，与那先生判断者毫发不差。諕得那龙王魂飞魄散。少顷苏醒，对众水族曰：「尘世上有此灵人，真个是能通天地理，却不输与他啊！」鲥军师奏云：「大王放心。要赢他有何难处？臣有小计，管教灭那厮的口嘴。」龙王问计，军师道：「行雨差了时辰，少些点数，就是那厮断卦不准，怕不赢他？那时捽碎招牌，赶他跑路，果何难也？」龙王依他所奏，果不担忧。
逐句解 Line by line
The hours and amounts set in the decree did not differ by a hair's breadth from what the master had foretold. It frightened the Dragon King out of his very wits.
毫髮不差 is 'not off by a hair'; 諕 ('to frighten') is read xià (a form of 嚇), and 得 in 諕得 is the resultative de. 那 is nà. 魂飛魄散 ('soul flown, spirits scattered') is abject terror.
After a moment he came to himself and said to the water-tribe: 'That there should be such a seer in the mortal world — one who truly comprehends the patterns of Heaven and Earth! I am bound to lose to him!'
甦醒 is 'to revive, come round'; 靈人 is 'a man of uncanny insight.' 卻不輸與他 ('shall I not lose to him?') has 不 in its bù reading before the level tone of 輸.
The shad field-marshal submitted: 'Let Your Majesty set your mind at ease. What difficulty is there in beating him? Your servant has a small stratagem that will surely stop that fellow's mouth.'
鰣軍師 is the shad-fish 'field-marshal' of the dragon's court; 管教 ('to guarantee that') takes 教 as jiào; 那 is nà, 那廝 a contemptuous 'that fellow.'
The Dragon King asked for the plan, and the marshal said: 'Send the rain off its hour, and give it a few drops short, and then that fellow's divination will be proved inaccurate — how could you fail to beat him? Then smash his signboard, drive him packing, and where is the difficulty in that?'
行 in 行雨 ('to make rain') is xíng; 差 in 差了時辰 ('to err in the timing') is chà; 那 (那廝, 那時) is nà. 斷卦不準 is 'the divination proves inexact.' The plan is precisely to violate the decree just received.
The Dragon King followed his counsel, and indeed troubled himself no further.
依他所奏 is 'to act on what he submitted'; 果不擔憂 ('and truly did not worry') has 不 as bù. The dragon's ease is the measure of how completely he has been undone by flattery and pride.
The decree matching the forecast 'not by a hair,' the dragon is thrown into terror and, for one honest moment, grasps the truth: 袁守誠 is a true seer, and the bet is lost. But the moment passes, and his court's shad field-marshal offers the fatal remedy — the very stratagem the ministers' earlier warning had implicitly forbidden. Simply alter the rain: shift its hour, cut its measure, and the diviner's prediction will be 'wrong,' the wager won, the shop smashed.
The logic is a trap disguised as a solution. To win a bet about the rain, the dragon is counseled to falsify the very rain Heaven has just commanded — 行雨差了時辰，少些點數, 'send the rain off its hour, give it a few drops short.' The horror of the chapter is how small and petty the crime is in conception: a matter of one double-hour and a few drops of water, undertaken to save face against a fortune-teller. That the Dragon King 'troubled himself no further' shows him wholly blind to the enormity of what he is about to do.