海明威《乞力马扎罗的雪》：
He looked over to where the huge, filthy birds sat, their naked heads sunk in the hunched feathers. A fourth planed down, to run quick-legged and then waddle slowly toward the others.
请问此处的不定式to do结构在句子里做什么成份？
黑体部分为不定式短语作结果状语。
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down和to run 为什么加个逗号呢
