Help with GUI on loop

[Matthew_Cash]

I am trying to build a skript that will bring up a GUI will all of the players on the server, and when you click a player head, it will run command /duel </waitmenu <clicked player> I am running the format command on a loop-player, and the click action cannot remember what player is should run /waitmenu with. Can someone please help. Right now, the command will always do /waitmenu with the last player in the GUI.

command /duelmenu:
    trigger:
            open chest with 3 rows named "          &b&lDuel a Player" to player
            wait 3 ticks     
            set {duel.playercount} to 0
            clear {_players::*}
            loop all players:
                if loop-player is not player:
                    add loop-player to {_players::*}
                    set {_slot} to {duel.playercount} + 9
                    format slot {_slot} of player with loop-player's skull named "&a&l%loop-player%" with lore "&cClick to duel me!||||&eOr use:||&b/duel %loop-player%" to run [make player execute command "/waitmenu %{_players::%{duel.playercount}%}%"]
                    add 1 to {duel.playercount}