She then cried, 'My son, away quickly!'

我兒快去 — my son, go, quickly. She has held him for one sentence. Love and danger arrive in the same four characters.

Xuanzang said, 'For eighteen years I have not known the parents who bore me; only this morning have I seen my mother — how can I bear to part?'

今朝, this very morning, takes 朝 as zhāo — the character that has been cháo, court, everywhere else in the chapter. 割捨 is to cut and let go: parting treated as surgery. Eighteen years, and about ten minutes.

The lady said, 'My son, withdraw at once and be gone.'

火速, fire-speed, is still ordinary Chinese for at once. 抽身, to pull your body out, is the word for extricating yourself from a situation you are stuck in.

'If the villain Liu returns, he will surely take your life.'

害你性命, harm your life, meaning kill you. She is not speculating. She has watched him do it.

'Tomorrow I shall feign an illness, saying I once vowed a hundred pairs of monk's shoes in years past,'

The plan arrives fully formed, which means she has been building it since roughly the moment she believed him. 假裝一病, fake an illness; 許捨, to have vowed to give away — a hundred pairs of monk's shoes, an alms-vow that nobody could reasonably query.

'and come to your temple to redeem the vow.'

還願, to give a vow back, to make good on something promised to a god, with 還 as huán, to return. It is one of the most ordinary religious acts in Chinese life, which is exactly what makes it serviceable as cover.

'At that time I shall have words for you.'

那時節, at that juncture, with 那 as the pointing nà. She has more to say, and she will not say it inside this building.

Xuanzang did as she said and took his leave.

依言拜別 — did as told, bowed, left. Six characters, and he walks back out of the house his mother lives in.