Thanks for replying!
I've tried to set the multiply on a negative number, but that only reversed the problem (player only gets pushed when attacked from right, but player gets drawn into the enemy when attacked from left).
I need the player to get pushed to the opposite direction from where the attack comes from. Isn't that was Vector3 Invert should do in this case?
PS: When I remove Vector3 Invert, nothing changes. So it's obviously not working. Am I using it wrong, or is that action in Playmaker broken?