book confusion

Question

I get what this article is saying but I'm still confused of what my book said:

ex:

Vous avez passé la journee a la plage, les garcons?
A la plage? Non! Nous, on a fait du skate avec des copains.

In here, why was 'on' before 'nous'?

Accepted Answer

This is because the colloquial use of on as nous still has nous as the stress pronoun. The difference becomes maybe a bit clearer if you compare these two sentences:
Eux, ils ont fait du skate.Nous, on a fait du skate.
The first pronouns (eux, nous) are the stress pronouns, where as the second ones (ils, on) are the personal pronouns.
moi-toi-lui-elle-me-you-him-her-simple-cases-that-use-stressed-pronouns
how-to-say-us-you-them-simple-cases-of-use-nous-vous-eux-elles-disjunctive-stress-pronouns