on any move:
    if {LastUpdate::%player%} is set:
        if difference between {LastUpdate::%player%} and now is more than 5 seconds:
            clear {LastUpdate::%player%}
    if {LastUpdate::%player%} is not set:
        if player's helmet or player's chestplate or player's leggings or player's boots is air:
            set {_damage} to true
            loop all blocks in radius 10 around player:
                if loop-block is fire or lava:
                    set {_damage} to false
                    exit loop
            if {_damage}:
                damage player by 3 hearts
                send "&cZałóż zbroje! Jest ci zimno!"