一並無蹤 Master Horse And Baggage Gone
你們走了，不知師父如何，我們快去看看。」三人急回來，果然沒了師父，連行李、白馬一並無蹤。慌得個八戒兩頭亂跑，沙僧前後跟尋，孫大聖亦心焦性燥。你们走了，不知师父如何，我们快去看看。」三人急回来，果然没了师父，连行李、白马一并无踪。慌得个八戒两头乱跑，沙僧前后跟寻，孙大圣亦心焦性燥。
逐句解 Line by line
You two ran off, and heaven knows what has become of the master. Let us get back there quickly and look."
Pilgrim stops arguing the instant the real problem occurs to him. The change of subject is the characterisation.
The three of them hurried back, and sure enough the master was gone — baggage and white horse with him, not a trace of any of them.
果然 is sure enough, and the novel uses it here with real cruelty: the reader has already watched the abduction, so the word confirms a dread rather than reporting news. 一並 is all together, the lot of them at once.
Bajie in his panic went dashing about in both directions at once; Sha Monk hunted front and back; and even the Great Sage Sun was frantic and hot-tempered with it.
慌得 puts 得 at de, the toneless join between a state and how far it went — panicked, and panicked to the point of running about. 兩頭亂跑 is running wildly at both ends, which is less a description of Bajie's route than of his mind. 心焦性燥 is anxious and short-tempered, and the point of the line is the word 亦: even Pilgrim, this time.
The novel gives each of the three a different panic. Bajie runs in two directions, Sha Monk searches methodically, and Pilgrim — who is never rattled — is rattled.
That last detail is the one that tells the reader how bad this is. The measure of a crisis in this book has never been the size of the demon; it is whether the monkey loses his temper.