Chapter 8 - Challenge 1 - Why Timer?

Hi,

I am working on Challenge 1 of Chapter 8 - Forces.

I am wondering why the text uses Timer to call an extension method in SKScene? Can the same functionality be created using combinations of SKAction.run and SKAction.wait?

Is this to show multiple ways of implementing - or would using SKAction being the wrong implementation for this functionality?

Thanks for any pointers!

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