該当部分コードで意味不明な挙動が…

every 10 tick:
    loop players:
        delete {_helmet}
        delete {_name}
        set {_helmet} to loop-player's helmet
        set {_name}   to uncolored name of {_helmet}
        if {_name} contains "NightVision":
            apply night vision 2 to loop-player
        else:
            remove night vision from loop-player