1.   @EventHandler
2.   public void onTeleportOutOfBorder(final PlayerTeleportEvent event) {
3.     final Player player = event.getPlayer();
4.     final GameArena arena = this.arenaManager.findArenaByPlayer(player.getUniqueId());
5.  
6.     if (arena == null || event.getCause() != PlayerTeleportEvent.TeleportCause.ENDER_PEARL) {
7.       return;
8.     }
9.  
10.     final WorldBorder border = arena.getBorder(player.getUniqueId());
11.     if (border == null) {
12.       player.sendMessage("wykrywanie perly poza borderem, ale border == null | debug, jak ci sie to pokazuje to napisz");
13.       return;
14.     }
15.  
16.     final double worldborder = player.getWorld().getWorldBorder().getSize() / 2.0;
17.     if (border.getCenterX() + worldborder < event.getTo().getX()
18.         || border.getCenterX() - worldborder > event.getTo().getX()
19.         || border.getCenterZ() + worldborder < event.getTo().getZ()
20.         || border.getCenterZ() - worldborder > event.getTo().getZ()) {
21.       event.setCancelled(true);
22.       player.sendMessage(colored(MessagesConfig.ARENA$CANNOT_USE_PEARL_OUTSIDE_BORDER));
23.       player.getInventory().addItem(new ItemStack(Material.ENDER_PEARL));
24.     }
25.   }
26.