Getting if a Player got hit in the Back?

How would I check if a player hit another player in the back? I think it might have to be done with comparing yaws, but can someone show me how I can do that?

 

Comparing yaw with angle between entities.

 

Math.abs(player1.getLocation().getDirection().angle(player2.getLocation().getDirection())) < SPECIFIED_ANGLE
declare the specified angle yourself, it is the offset for the angles. If the part before < = 0, then the players are looking towards the same way.

I also recommend a location comparison to see if the player is standing directly beside then (might not be neccesary)

 

fireblast709 shouldn't I make it check if it is >=o && <= 15 because they they wouldn't have to be looking in the exact direction?

 

You don't need the bigger than 0 thing, because you already have the absolute value.
<15 should work, but I recommend a slightly bigger angle. Maybe about 45 degrees.

 

Ok thanks!