How is “in action” used?

In Spider-Man: Into the Spider-Verse (2018), one line is: “Look, I've seen him in action. He's got potential.”

Which movie is “in action” from?

The clip at the top of this page is from Spider-Man: Into the Spider-Verse (2018).

if sb / sth is in action, they are doing the activity or work that is typical for them

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if sb / sth is in action, they are doing the activity or work that is typical for them

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

Look, I've seen him in action. He's got potential.

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