NPC action with loop

[Kawita]

I'm trying to create a loop for an NPC that counts down from 10 to 0 every second, and when it reaches 0 the loop stops and performs an action like hiding the npc, the problem I'm having is that it doesn't stop at 0 and when clicking on the npc the numbers get out of control, I just want the npc to count from 10 backwards to 0 and that when it reaches 0 the npc hides and on the other hand clicking on the npc does not affect or alter his account In the loop

 

guild_vs1-1,50,49,3    script    Valkyrie    811 ,{

     query_sql "UPDATE `valkyrie` SET `puntos` = 10";
OnInit:
    query_sql "SELECT `puntos` FROM `valkyrie`",.@puntos$;

    do {
    
    waitingroom "HP: "+.@puntos$+"",0;    

    query_sql "UPDATE `valkyrie` SET `puntos` = `puntos` - 1";

    sleep 1000;

    } while(1); 
    
    disablenpc "Valkyrie";
end;
}