Taking Directional Damage

Thinking about how some of my games operate, I was wondering how to go about implementing directional damage. The example being whether the player is being hit from the front or from behind.

I'm not sure how I would create this since the player sprite can be considered facing left or right. And with 8 direction behavior, you would have front and back depending on the direction the player was facing.

Any ideas on how this could be done would be appreciated.

What exactly do you mean by "directional damage" ? Do you mean Knockback?

I'm guessing different amount of damage, depending on whether the bullet hit from the front or from behind?

You can use angle() and anglediff() expressions.

Something like this:

Bullet on collision with Player
   If anglediff(Player.angle,  angle(Bullet.x, Bullet.y, Player.x, Player.y))<45   // player hit from behind
   Else  // Player is facing the bullet
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