伸過頭來 Put Out Your Head
羅剎道：「潑猴！少要饒舌，伸過頭來，等我砍上幾劍：若受得疼痛，就借扇子與你；若忍耐不得，教你早見閻君。」罗刹道：「泼猴！少要饶舌，伸过头来，等我砍上几剑：若受得疼痛，就借扇子与你；若忍耐不得，教你早见阎君。」
逐句解 Line by line
The Rākṣasī said, 'Wretched ape! Less of your prating. Put your head out here and let me lay a few sword-strokes on it. If you can take the pain, I will lend you the fan; and if you cannot bear it, I will send you to see King Yama the sooner.'
Two 得 stand thirteen characters apart and take opposite readings. 受得疼痛 turns on whether he can bear it, so the light toneless de; 忍耐不得 is "cannot endure," so dé. 閻君 is Yama, judge of the dead — "I will send you to see King Yama the sooner" is the period's standard way of promising somebody a swift death. The whole sentence is one utterance which the source divides at a semicolon and which is rejoined here: the two 若-clauses run strictly parallel, the second the opposite of the first rather than a step up from it.
Her answer to the offer is to propose an ordeal. Put out your head, take a few strokes, and if you can bear it you shall have the fan. It is not a negotiation but a test with a punishment attached, and the two halves are set out with formal symmetry: bear it and be lent the fan, fail and go to King Yama.
What she is refusing is subtler than the fan. Pilgrim has just offered to arrange a meeting with her son, which is the thing she said she wanted, and rather than answer she changes the subject to whether he can survive being hit. The grievance does not want satisfying; it wants him to suffer.
The joke, which she cannot know and he does not mention, is that she has proposed the one trial he is certain to pass. His skull has withstood Erlang's blade, Laozi's furnace and the thunder gods' hammers. She is about to spend a dozen sword-strokes proving it.