當頭還要 Let Old Hog Take The Front
誰敢當先？」行者道：「我當先。」三太子道：「我奉旨降妖，我當先。」那獃子便莽撞起來，高聲叫道：「當頭還要我老豬。」谁敢当先？」行者道：「我当先。」三太子道：「我奉旨降妖，我当先。」那呆子便莽撞起来，高声叫道：「当头还要我老猪。」
逐句解 Line by line
Who dares go first?"
當先 is to take the lead, to go at the head — and the question is a formality. Everyone present knows the answer.
Pilgrim said, "I go first."
Six characters, no elaboration at all. This is the only offer in the chapter made without a proverb, a joke or a condition attached.
The Third Prince said, "I have an edict to subdue the fiend. I go first."
降 is xiáng, to subdue, and 子 takes zǐ. Nezha's claim is procedural — he holds the warrant, so the duty is his. He has been the most correct person in the chapter throughout.
The Idiot then blundered in and shouted at the top of his voice, "Old Hog wants the front!"
莽撞 is blundering, rushing in without looking, and it is still the ordinary word for exactly this. 老豬 is what Bajie calls himself when he is pleased with himself — old Hog, on the pattern of Pilgrim's 老孫. 還 is hái, as well, into the bargain.
Three volunteers in four lines, and they volunteer in three different registers: plainly, procedurally, and at the top of the voice.
Bajie shouting for the front is the same man who said no, no, no in the first quarter of the chapter and had to be talked into a fight by a joke about wind. He has an army behind him now, which makes all the difference.