Help With Event

When the kit sniper shoots an arrow from 45 blocks away and it hits a player they die instantly.

Code:

    @EventHandler
     private void damage(EntityDamageByEntityEvent e) {
      if (e.getDamager() instanceof Player) {
       if(e.getEntity() instanceof Player) {
        if (e.getCause() == DamageCause.PROJECTILE) {
         Player playerWhoShot = (Player) e.getDamager();
         Player playerWhoWasHit = (Player) e.getEntity();
         if(kitselected.get((playerWhoShot)).equals("sniper")){
         if (playerWhoShot.getItemInHand().getType() == Material.BOW) {
          if (playerWhoShot.getLocation().distance(playerWhoWasHit.getLocation()) > 45) {
              playerWhoWasHit.damage(20.0);
           }
          }
         }
        }
       }
      }
     }

 

Well if the damage cause was projectile, you can't cast the damager to Player...