Said the princess, 'My lord, let him go out by the back gate.'

She will not let the detail go. The 後門, the back gate, is the last piece of her plan — it keeps Tripitaka away from the mob of lesser imps massed at the front, who would not stop to ask questions.

Said the fiend, 'How tiresome! Let him go and be done — who cares whether it's the back gate or the front!'

And he cannot be bothered. 奈煩 is "what a nuisance, how tiresome," 甚 is shén, and the closing 哩 is the light li. His shrug — 又管他甚麼, who cares which — is exactly the laziness the princess has been counting on. She wanted a decision; she gets an inability to be interested, which serves her just as well.

Then he snatched up his steel blade and called out loudly, 'You there, Zhu Eight Rules — come here. It is not that I fear you, that I will not fight you; but for the sake of my wife I spare your master. Get you quickly to the back gate, find him, and be off to the west. Should you come again to trespass on my domain, I will by no means spare you.'

綽了鋼刀 is to snatch up the steel blade. Then comes the face-saving formula that every bully needs: 我不是怕你, "it is not that I am afraid of you" — nobody says this who has not thought about it. He hangs the concession on his wife instead: 分上 (分 = fèn) is "for the sake of, on account of," and 看著 uses 著 as the ongoing zhe. 尋著 takes 著 as zháo — search and actually find, successfully. His parting threat against 犯我境界, trespassing on his territory, is the sort of line a story tells you only when the trespass is coming.