java – How do I get the player from the LivingEntity so I can make this knockback effect on the amethyst sword?

Like the title says, how do I get the player from the LivingEntity so I can make this knockback effect on the amethyst sword?
i want the amethyst sword to give knockback 10 to any entity i hit and in the direction im looking at

@SubscribeEvent
public static void onPlayerAttack(LivingAttackEvent event){
    Entity entity = event.getEntity();
    LivingEntity living = event.getEntityLiving();
    Item item = ItemInit.AMETHYST_SWORD.get();
    if (event.getEntity() instanceof LivingEntity){
        living.applyKnockback(10, 20, 20);
        System.out.println("i print");
    }
}