How to remove my enemy after 1 second if enemy health equals 1. Pygame

# Code
class Enemy1(object):
    def __init__(self, x, y):
        self.x = x
        self.y = y
        self.hit_box = (self.x-10, self.y -10, 70, 70)
        self.animation_images =[pygame.image.load("Enemy1_animation_0.png"), pygame.image.load("Enemy1_animation_1.png"),
        pygame.image.load("Enemy1_animation_2.png"), pygame.image.load("Enemy1_animation_3.png")]

        self.sprites = [pygame.image.load('explosion1.png'), pygame.image.load('explosion2.png'),  pygame.image.load('explosion3.png'), pygame.image.load('explosion4.png'), pygame.image.load('explosion5.png'), pygame.image.load('explosion6.png')]
        self.current_sprite = 0



        self.animation_count = 0
        self.reset_offset = 0
        self.offset_x = random.randrange(-150, 150)
        self.offset_y = random.randrange(-150, 150)
        self.health = 5

    def main(self, display):
        all_sprites = self.sprites
        if self.animation_count + 1 == 16:
            self.animation_count = 0
        self.animation_count += 1

        if self.current_sprite + 1 == 16:
            self.current_sprite = 0
        self.current_sprite += 1


        if self.reset_offset == 0:
            self.offset_x = random.randrange(-150, 150)
            self.offset_y = random.randrange(-150, 150)
            self.reset_offset = random.randrange(120, 150)
        else:
            self.reset_offset -= 1

        if player.x + self.offset_x > self.x-display_scroll[0]:
            self.x += 1
        elif player.x + self.offset_x < self.x-display_scroll[0]:
            self.x -= 1

        if player.y + self.offset_y > self.y-display_scroll[1]:
            self.y += 1
        elif player.y + self.offset_y < self.y-display_scroll[1]:
            self.y -= 1

        if self.health > 1:
            display.blit(pygame.transform.scale(self.animation_images[self.animation_count//4], (50, 50)), (self.x-display_scroll[0], self.y-display_scroll[1]))
        if self.health == 1:
            display.blit(pygame.transform.scale(self.sprites[self.current_sprite//4], (50, 50)), (self.x-display_scroll[0], self.y-display_scroll[1]))

        self.hit_box = (self.x-display_scroll[0]-10, self.y-display_scroll[1]-10, 70, 70)


enemy1 = [Enemy1(300, 400)]

while True:
    display.fill((0, 0, 0))

#Spawn enemy

if time.time() >= enemy1time:
    enemy1.append( Enemy1( 100, 500 ) )
    enemy1time = time.time() + 13


#Enemy lose health and meant to be removed

for enem in enemy1:
        for bullet in player_bullets:
            if pygame.Rect(enem.hit_box).collidepoint(bullet.x, bullet.y):
                player_bullets.remove(bullet)
                enem.health -= 1

                if enem.health == 1:
                    #After 1 second remove the enemy and also remove hitbox