Changing Sidewarp Destination

Is there a command that makes it so the side warp destination, or timed warp destination in other words, is changed when something happens, in this case, the enemy dies. I don't want to use a Pit Warp, because that'll just instantly warp me to the Pit Warp destination. Instead, I want the Side Warp to change, and let the screen finish the timed warp, but the timed warp destination will be at a different screen, instead of what was normally set. Here is what I have so far:

ffc script worm_heart{
	void run(){
		npc ghost_enemy = Screen->LoadNPC(1);
		int x = this->X;
		int y = this->Y;
		while (true){
			if (ghost_enemy->HP <= 100){
				this->CSet = 4;
			}
			if (ghost_enemy->HP <= 50){
				this->CSet = 2;
			}
			if (Screen->NumNPCs() >= 1){
				ghost_enemy->X = x;
				ghost_enemy->Y = y;
				x = this->X + 8;
				y = this->Y + 8;
			}
			if (Screen->NumNPCs() == 0){
				Link->PitWarp(7, 06);  // I WANT THIS LINE CHANGED
			}
			Waitframe();
		} // end of while loop
	} // end of void run
} // end of enemy_ghosting