By this time the palace attendants had all fled clean away, and who among them dared approach the bier to steady the coffin?

走得精光 is "fled until there was nobody left"; 得 is the linking de. 那個 here is the rhetorical question word, nǎ, equivalent to 哪個 — "who, exactly?" The answer is nobody.

Happily the upright Xu Maogong, the fierce-principled Prime Minister Wei, the stout-hearted Qin Qiong, and the headlong-bold Jingde came forward to hold the coffin and cried, 'Your Majesty, if there is anything you cannot set your heart at rest about, tell us — do not play the ghost and terrify your kin.'

Four men stay, and the novel labels each with the quality he is famous for: 正直 upright, 理烈 fierce on principle, 有膽量 with nerve, and 忒猛撞 — "far too headlong" — for Yuchi Jingde, which is less a compliment than a diagnosis. 丞相, prime minister, uses xiàng. 扶著 uses zhe. 甚麼 is shén me. 弄鬼 is "to play ghost tricks," still the ordinary Chinese for pulling a fast one. They approach the coffin of their sovereign and tell him to stop messing about.

Wei Zheng said, 'It is no ghost-trick — this is His Majesty returning to life. Quick, fetch tools!'

還魂 is huán hún. 器械 are implements — here, whatever will get a coffin lid off in a hurry.

They forced open the coffin-lid, and there indeed sat Taizong within, still crying, 'I'm drowning! Who will pull me out?'

還叫 uses hái, still shouting. 救撈 is to pull someone out of water. He is sitting up in a coffin in a dry hall, asking to be fished out.

Maogong and the others came forward to raise him, saying, 'Your Majesty is awake — have no fear; your servants are all here to guard you.'

甦醒, sū xǐng, is to come round. 護駕 is to guard the imperial person — the formal phrase, offered to a man who has just been shouting about drowning. 都 is dōu.