checking Bool true from another Script?

Either make a static script where you store variables, use getcomponent or add a reference to the script!

in script 2

add

public BulletScript bulletScript ;

to where you declare things in script2/health script.

everything in BulletScript needs to be declared as public so you can access them from another script. make sure to drag the bullet script onto script2.

now you can access everything by calling for it

bulletScript.armed = false;

 if(bulletScript .armed){
 }

tbh if i were you i'd use

https://docs.unity3d.com/ScriptReference/Collider.OnCollisionEnter.html

& use GetComponent

everything in BulletScript needs to be declared as public so you can access them from another script

https://docs.unity3d.com/ScriptReference/GameObject.GetComponent.html

when you hit it

so something like

 void OnCollisionEnter(Collision collision)    {
         if (collision.gameObject.GetComponent<BulletScript> ()){
             if (collision.gameObject.GetComponent<BulletScript> ().Armed == true) {
             // do logic
             }
         }
     }

or

  void OnCollisionEnter(Collision collision)
         {
             BulletScript bulletScript  = collision.gameObject.GetComponent<BulletScript> ;
             if(bulletScript){
                 if (bulletScript.Armed == true) {
                 // do logic
                 }
             }
         }

Here is some stuff to read/watch about statics too, might be handy in the future. https://unity3d.com/learn/tutorials/topics/scripting/statics