How to determine which direction a projectile came from

So i got the Zombie T Pose Animation pack, and it has 4 different animations for being shot from 4 different directions. I want to incorporate this in my game, i think montages would probably be the way to go, but i dont know how to find the direction that the projectile came from to incorporate this. Does anybody know how i can do this?

There are a couple of ways but it may ultimately depend on how your projectile deals out damage (if/how instigator is set or if damage causer is set) and how it “self-destructs” (when/if/how destroy actor is called) these should get you started on the right path:

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