szybko się zastanowić

I'd be thinking on my feet, and four were better than two.

Certainly he wasn't used to thinking quickly on his feet.

We're really running the team and he can think on his feet.

She had to use a lot of initiative and think on her feet.

I had to be able to think on my feet.

You need someone who can think on his feet and work with all kinds of people.

You know me, I think better on my feet, always have.

It's about moving with the season and thinking on your feet.

Nothing was going exactly as he'd planned, but he could think on his feet.

So this was what they meant by thinking on your feet.