on click holding eye of ender or barrier:
    cancel event
    if {reveal.%player%} is set:
        wait 1 tick
        remove all barrier named "&6Spieler &cVerstecken" from player
        set slot 0 of player's inventory to shiny eye of ender named "&5Spieler &aAnzeigen"
        delete {reveal.%player%}
        loop all players in radius 5 around player:                                         #Optional: hide all players from player
            hide loop-player from player
    else:
        remove all eye of ender from player
        reveal all players from player
        set slot 0 of player's inventory to glowing barrier named "&6Spieler &cVerstecken"
        set {reveal.%player%} to true