Doesn't Recognize Arrow

Hi, I am trying to make a headshot feature in my plugin, and it doesn't work. When I shoot another player with an arrow, it will broadcast "Event fired!" and "Hit a player", but it won't broadcast "Entity is an arrow!". Am I doing something wrong?

Code:java

@EventHandler
    public void onArcherheadshot(EntityDamageByEntityEvent event){
        plugin.getServer().broadcastMessage("Event fired!");
        int x1, x2, z1, z2;
        Entity entity = event.getDamager();
        if(event.getEntity() instanceof Player){
            plugin.getServer().broadcastMessage("Hit a player!");
            if(entity instanceof Arrow){
                plugin.getServer().broadcastMessage("Entity is an arrow!");
                Arrow arrow = (Arrow) event.getEntity();
                if(arrow.getShooter() instanceof Player){
                    plugin.getServer().broadcastMessage("Shooter is a player!");
                    Player shooter = (Player) arrow.getShooter();
                    Location sLoc = shooter.getLocation();
                    Location vLoc = entity.getLocation();
                    int sx = sLoc.getBlockY(), sz = sLoc.getBlockZ(), vx = vLoc.getBlockX(), vz = vLoc.getBlockZ();
                    if(sx > vx){
                        plugin.getServer().broadcastMessage("sx > vx!");
                        x1 = sx;
                        x2 = vx;
                    } else {
                        plugin.getServer().broadcastMessage("sx !> vx!");
                        x1 = vx;
                        x2 = sx;
                    }
 
                    if(sz > vz){
                        plugin.getServer().broadcastMessage("sx > vz!");
                        z1 = sx;
                        z2 = vx;
                    } else {
                        plugin.getServer().broadcastMessage("sx !> vz!");
                        z1 = vz;
                        z2 = sz;
                    }
                    int z = z1 - z2, x = x1 - x2;
                    int distSquared = z * z + x * x;
                    double dist = Math.sqrt(distSquared); //Pythagorean Theorm
                    if(dist >= plugin.getHeadshotDistance()){
                        plugin.getServer().broadcastMessage("Distance is greater than " + plugin.getHeadshotDistance() + "!");
                        //Players
                        Player killed = (Player) event.getEntity();
                        Player killer = (Player) arrow.getShooter();
 
                        //Killed stuff
                        killed.getInventory().clear();
                        killed.setHealth(0);
                        killed.sendMessage(plugin.getHeadshotKilledMessage(killer));
 
                        //Killer stuff
                        killer.sendMessage(plugin.getHeadshotKillerMessage(killed));
                    }
                }
            }
        }
    }

 

Then the damage is not due an Arrow, is it?

 

No, I shot another player with an arrow.

Wait should I check if the entity is an instanceof Projectile, because it might think that it is an arrow being held?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.