Some of you may be having issues noting that enemies when running at you can't be knocked back.
This appears to be related to the momentum of the enemy moving at you.
To resolve this issue in AuraAttributeSet.Cpp right above
Props.TargetCharacter->LaunchCharacter()
Add the following:
Props.TargetCharacter->GetCharacterMovement()->StopMovementImmediately();
This appears to resolve the issue and make the skill push the enemy back. Not sure if this is the correct way to resolve it - but it works as of 315.