倒身下拜 Down On His Face Weeping
那山門口四大金剛卻才閃開路，讓行者前進。眾阿羅引至寶蓮臺下，見如來倒身下拜，兩淚悲啼。如來道：「悟空，有何事這等悲啼？」那山门口四大金刚却才闪开路，让行者前进。众阿罗引至宝莲台下，见如来倒身下拜，两泪悲啼。如来道：「悟空，有何事这等悲啼？」
逐句解 Line by line
Only then did the Four Great Vajra Guardians at the mountain gate open a way and let Pilgrim go forward.
卻才, only then, is the narrator marking exactly how grudging this is. They open a path because they have been overruled.
The Arhats led him to the foot of the jewelled lotus throne, and seeing the Tathagata he threw himself down on his face in worship, weeping tears of grief.
倒 is dǎo, going over — 倒身下拜 is to go down full length rather than kneel, the deepest obeisance there is. This from the monkey who was shouting at the gate a moment ago.
The Tathagata said, "Wukong, what is it that makes you weep so bitterly?"
Twelve characters, and there is not a word of reproof in them. The Buddha uses his dharma name and asks what is wrong.
The guardians have to stand aside and the narrator will not let it pass unmarked. Only then. They opened the way because they were made to.
And Wukong, who was roaring like thunder outside, goes down full length on the floor. Both things are true of him and the chapter has now shown them within three sentences of each other: he will scream at a doorman and prostrate himself before the person behind the door.
The Buddha's question is the kindest sentence anyone has spoken in the chapter. No rebuke for the noise, no reference to the scene at the gate — just his name and a question about why he is crying.