〜なり
JLPT N1 Immediacy and timingas soon as; the moment
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なり means that right after one action, an unexpected second one followed by the same subject. Attach it to a verb's dictionary form. Unlike が早いか, the two actions share one subject and the result is often startling.
Examples
はをなり、た。 Kanojo wa tegami o yomu nari, nakidashita.
The moment she read the letter, she burst into tears.
はになり、へにた。 Kodomo wa ie ni kaeru nari, soto e asobi ni itta.
As soon as the child got home, he went out to play.