update

src/main/java/hu/jgj52/pvpcore/Commands/SpectateCommand.java

@@ -7,6 +7,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
+import org.bukkit.metadata.FixedMetadataValue;
 
 public class SpectateCommand implements CommandExecutor {
     private final Main plugin;
@@ -40,6 +41,7 @@ public class SpectateCommand implements CommandExecutor {
             return true;
         }
 
+        player.setMetadata("IsSpectating", new FixedMetadataValue(plugin, true));
         player.setGameMode(GameMode.SPECTATOR);
         player.teleport(target);
         player.sendMessage("§7[§9§lInsane§e§lDuels§7] §7» §aMostantól §e" + target.getName() + "§a párbaját figyeled!");

src/main/java/hu/jgj52/pvpcore/Listeners/DuelEndListener.java

@@ -83,7 +83,7 @@ public class DuelEndListener implements Listener {
                             .build();
 
                     meta.addEffect(effect);
-                    meta.setPower(1);
+                    meta.setPower((int) 0.5);
                     firework.setFireworkMeta(meta);
                 }, delay);
             }

src/main/java/lnmpro/Listeners/SpectatorListener.java

@@ -1,17 +0,0 @@
-package lnmpro.Listeners;
-
-import org.bukkit.GameMode;
-import org.bukkit.event.EventHandler;
-import org.bukkit.event.Listener;
-import org.bukkit.event.player.PlayerTeleportEvent;
-import org.bukkit.event.player.PlayerTeleportEvent.TeleportCause;
-
-public class SpectatorListener implements Listener {
-
-    @EventHandler
-    public void onSpectatorTeleport(PlayerTeleportEvent event) {
-        if (event.getPlayer().getGameMode() == GameMode.SPECTATOR && event.getCause() == TeleportCause.SPECTATE) {
-            event.setCancelled(true);
-        }
-    }
-}