Why delete scene when bullet hits enemy he dies

i have main scene to which i have added player(CharacterBody2d) and enemy(Node2d) ,player shoots bullets
In main scene script coppypastes enemy and many enemy moving in circles
I need it when the bullet hits the enemy he dies
In scene enemy i have enemy which moves along the path2d

extends Node2D

var enemyscen = preload("res://enemy.tscn")

func _on_timer_timeout():
	var instance = enemyscen.instantiate()

script in main scene

FYI duplicate of this post: