and then



In the following sentences, I'm not sure exactly what 'and then' means.
I'd appreciate it if anyone could paraphrase it so that I can understand what it means.

” Because sometimes you get a yes, and even if you weren't prepared for that yes, you rise to the occasion. You aren't ready,
and then you are. It's not logical, but it's magical.”

Does it mean, ” You aren't ready now and at the same time you're ready.”? The author says, ”it's not logical”, so I guess the sentence means something contradictory, but how can ”and then” mean that contradiction?

Thank you!
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