How to reference assets that are inside a folder?,Referencing assets in the scene

I have a folder in my scene called "Cowboy", inside it are two gameObjects, one called "Blue" and "Red".

I wanted that when Blue shoots, Red's animation goes to "RedDead", but when I do that, it says that this component doesn't exist in the current context.

How would I access this Cowboy folder and thus be able to change the animations?,I want to reference my sprites that are in a folder. Here's the idea: I have a folder called "Cowboy", inside it two gameObject (Sprites), one named "Blue" and "Red"

My code, I want to make that when the blue shoot, the animation of the red change, but I can not do that, says that "RedDead" does not exist in the current context

How to reference this?