Question Animation extending when gameobject rotates - any way to prevent that?

Hello,

I've made and animated some first person arms in Blender. I've set them up to use a blend tree so as the player looks down, it animates the right arm downwards, and when the player looks up it animates upwards. This works surprisingly well. (Side note: I did this because my understanding is I can't rotate bones while an animator is active)

I also have a very simple throw animation, however, as you can see in the video as the throw animation is played it covers more distance depending on how the arm is rotated. This is the problem.

Is there a way to just have the throw anim play consistently regardless how the arm is rotated?

Thanks!