First script plays animation but second script stops if from playing said animation

I have been going through JimmyVegas's Survival Horror tutorials. I made a script to play the falling back animation of a zombie. This script (ZombieDeath) works perfectly. However, the AI script stops the animation from happening. The ZombieDeath script still works, because the music stops after killing the zombie, but the zombie still keeps moving. Here is the ZombieDeath script:

And here is the ZombieAI script:

What is the issue?