Mix "run/walk" and "block" animation at same time

How do i do that?
i use "adventurer" from assets store.

here the script i have made

Code (csharp):

1. var swoosh : AudioClip;
2.  
3. function Start(){
4. audio.clip = swoosh;
5. }
6.  
7. function Update ()
8. {
9.    if (Input.GetMouseButton(0))
10.  
11.     {
12.        animation.Play("swordStrike2");
13.        audio.Play();
14.        //yield WaitForSeconds ( 1.0 );
15.  
16.     }  
17.        else if (Input.GetMouseButton(1))
18.     {
19.        animation.Play("swordStrike3");
20.  
21.     }  
22.  
23.    else
24.     {
25.       animation.CrossFade ("idle");
26.     }
27.    
28.     if(Input.GetKey(KeyCode.LeftControl))
29.     {
30.     animation.Play("shieldBlock");
31.     }
32.    
33.     else if(Input.GetKeyUp(KeyCode.LeftControl))
34.     {
35.     animation.Stop("shieldBlock");
36.     }
37. }
38.