打殺妖精 Untie Him First or Strike First
長老道：「徒弟，快來解解繩兒，綁壞我了。」行者道：「師父不要忙，等我打殺妖精，再來解你。」急抽身跑至中堂，正舉棍要打，又滯住手道：「不好，等解了師父來打。」长老道：「徒弟，快来解解绳儿，绑坏我了。」行者道：「师父不要忙，等我打杀妖精，再来解你。」急抽身跑至中堂，正举棍要打，又滞住手道：「不好，等解了师父来打。」
逐句解 Line by line
The elder said, "Disciple, come quickly and get these ropes undone. They have bound me raw."
綁壞我了 is they have tied me until I am damaged — the master's first practical complaint of the chapter, and it is about rope burns. 解解繩兒 doubles the verb to make it quick and informal: get these off me.
Pilgrim said, "Master, do not be in a hurry. Let me kill the fiends first, and then I will come and untie you."
The plan is sound and it is about to fall apart entirely. 打殺 is to beat to death, plainly stated. Wukong has two jobs and he cannot decide which order to do them in, which is the joke of the next passage.
He whipped round and ran to the main hall, and was just raising the rod to strike when he checked his hand and said, "No good. Better untie the master first and then come and strike."
滯住手 is to have the hand stick — the arm stops halfway through the blow. This is the first of what turns into two or three full circuits, and a simple question of order paralyses the most decisive character in the book.
Wukong has spent the chapter being the one who thinks before acting, and it finally breaks him. Kill the fiends and the master stays tied while it happens; untie the master and the fiends might wake. Both risks are real.
It is a genuinely difficult decision and he handles it by running back and forth between the two rooms. The novel makes no attempt to dignify this.