on chat:
    if held item is ghast tear with name "&fWalkie Talkie":
        loop all players:
            loop the loop-player's inventory:
                if loop-player's inventory contains ghast tear with name "&fWalkie Talkie":
                    send "&8Walkie Talkie: &7%player%: &8%message%" to loop-player
                    wait 5 seconds
                    stop