on rightclick on player:
    if {pojedynek.%player%} is false:
        set {zapro.X.%player%} to "%clicked entity%"
        send "&6Wyzwales gracza %clicked entity% na pojedynek!" to player
        send "&6Zostales wezwany na pojedynek przez %player%!" to clicked entity
        if {zapro.X.%clicked entity%} is "%player%":
            send "&6Zaakceptowales pojedynek z %clicked entity%!"
            if {zapro.X.%player%} is "%clicked entity%":
                set {pojedynek.%player%} to true
                loop all players:
                    hide loop-player to player
                    hide loop-player to clicked entity
                    reveal loop-player to clicked entity
                    reveal clicked entity to player
                loop 5 times:
                    send "&6Walka rozpocznie sie za: %6 - loop-number%!" to player
                    send "&6Walka rozpocznie sie za: %6 - loop-number%!" to clicked entity
                    wait 1 second
                wait 5 second
                set {bicie.%player%} to true                
on damage of player:
    if {bicie.%player%} is false:
        cancel event
        send "&6Najpierw wezwij gracza na pojedynek!"