Nos lo trajimos ...... Why nos?

Question

We brought him (I guess).

Is it traerse always when you bring a person along, and it's llevar (no se) when you take a person somewhere, but with traer does one always need se, and if not, why would they use se here? Why use se sometimes and not other times? Gracias.

Answer 1

The "se" is a constant source of confusion. In this case it could mean something like "we took him with us" (as in brought), but more context would be helpful.