Check if player is facing towards a player?

[Noblesuntzu]

Basically, I want to figure out if the attacker in a damage event is looking at the victim. I was looking into the 'facing' expression, but it seems like you can't check for players with it. Essentially what I want: I'm relatively sure that this is possible, just can't remember how to do it. Thanks! <3

on damage:
attacker is facing victim

 

[ShaneBee]

This maybe?
on damage:
target entity of attacker is victim

 

[ShaneBee]

I also tried this, it's checking if the entity the player is attacking is the victim, not necessarily if the player is looking at said entity. Thanks anyway though! <3