Reactor pattern how it works with threads

I study to learn Vert.x framework, but i don't understand how it work and what is Reactor pattern, i read this article https://dzone.com/articles/understanding-reactor-pattern-thread-based-and-eve and noticed that apart from standard design (one request one thread) Reactor pattern use event-driven architecture where single thread event loop take request put it to some code and provide handler to this block of code , and code in handler will be executed by this event loop, so golden rule don't block event loop.

What I don't understand is , from article:

Those handlers/callbacks may utilize a thread...

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By: StackOverFlow - Sunday, 15 April

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