Needing help with a script again

[Kidlatsv]

How do I activate and deactivate OnNPCKillEvent?

prt_fild08,240,263,3    script    Little Annie    716,{
// INITIAL ENCOUNTER
if (FirstEncounter == 0) {
    if(1) {
    mes .npc$;
    mes "Hi, mister...";
        emotion e_sob,0,"Little Annie";
    }
    else {
    mes .npc$;
    mes "Hi, miss...";
        emotion e_sob,0,"Little Annie";
    }
        next;
    mes "["+strcharinfo(0)+"]";
    mes "What's wrong?";
        next;
    mes .npc$;
    mes "My little Okja here is being bullied by Porings!";
        next;
    mes "["+strcharinfo(0)+"]";
    mes "Do you want me to teach them a lesson?";
        next;
    mes .npc$;
    mes "You'd do that for us?";
        next;
    mes "["+strcharinfo(0)+"]";
    mes "Yes I would, so don't be sad anymore.";
        next;
    mes .npc$;
    mes "If you could, please kill 10 Porings to teach them not to bully my little Okja anymore.";
        next;
    mes "["+strcharinfo(0)+"]";
    mes "I'll go and teach them a lesson, cheer-up!";
        next;
    mes .npc$;
    mes "Please teach those bullies a lesson for us...";
        set FirstEncounter, 1;
        close;
    }
// SUCCEEDING ENCOUNTERS
{
if ((FirstEncounter == 1) && (PoringKills < 10)) { 
    mes .npc$;
    mes "Please, punish those bullies for us.";
        }
        else {
if ((FirstEncounter == 1) && (PoringKills >= 10))
    mes .npc$;
    mes "You've done it! You punished those Poring Bullies!";
        next;
    mes .npc$;
    mes "I hope you don't mind, but little Okja tells me that we should give you a reward for your assistance.";
        next;
    mes .npc$;
    mes "You see, I make hats adorned with ears resembling those of my cute little Okja, and I want to make one for you as a form of recompense.";
        next;
    mes .npc$;
    mes "Speak to me again if you're interested!";
        set killingdone, 1;
        close;
    }
//
if (killingdone == 1) {
    mes .npc$;
    mes "As I've already mentioned, I can make you a hat adorned with replicas of my cute little Okja's ears.";
        next;
    mes .npc$;
    mes "I'll need materials to make it for you though, so please gather them for me~";
        next;
    mes .npc$;
    mes "I'll need 10,000 Zenies, 50 Animal Skins, 25 Green Herbs, and a Sweet Milk for my consumption, Hee~hee~.";
        next;
    mes "["+strcharinfo(0)+"]";
    mes "Make it for me then!";
        next;
            if ((Zeny >= 10000) && (countitem(919) >= 50) && (countitem(511) >= 25) && (countitem(627) >= 1)) {
                delitem 919,50;
                delitem 511,25;
                delitem 627,1;
                set Zeny, Zeny-10000;
                set PoringKills,PoringKills - 10;
                set oquest, 1;
                    mes .npc$;
                    mes "Here you are, thank you again!";
                        emotion e_no1,0,"Little Annie";
                        getitem 5407,1;
            }
                else {
                        mes .npc$;
                        mes "Come on, "+strcharinfo(0)+", I can't make the hat for you if you don't bring me what I need.";
                            close;
        }
    }
//
        OnNPCKillEvent:
        if( killedrid == 1002 ){
            set PoringKills,PoringKills +1;
            dispbottom "You have killed "+PoringKills+" Porings.";
        }
        end;
//
OnInit:
    .npc$ = "[^51ba31Little Annie^000000]";
    
    while(1){
        npctalk "Don't worry Okja, we'll punish them soon enough!";
        sleep 30000;
        }
    end;
    }
}
prt_fild08    mapflag    loadevent

Like here, I want the OnNPCKillEvent to activate only after line 37, then deactivate after line 59?

Edited October 13, 2017 by Cyro
code box

[Haruka Mayumi]

Here's the Script

        OnNPCKillEvent:
        if(FirstEncounter==1 && PoringKills<10){
          if( killedrid == 1002 ){
              set PoringKills,PoringKills +1;
              dispbottom "You have killed "+PoringKills+" Porings.";
          }
		}
        end;

 

Edited October 13, 2017 by Haruka Mayumi
Changed Comment