Getting enemy to switch costume and drop off screen when hit

Enemy Costume Switch

//spr_EnemyDead is a speparate sprite that contains the image of the enemy rotated slightly.
//Trying to get enemy once hit, to switch to spr_EnemyDead and then fall off screen, at the moment, as soon 
//as player bounces off head he switches back to alive sprite.

//Enemy Movement

hsp = dir * movespeed;
vsp += grav;
sprite_index = spr_enemy
//Horizontal Collision

if (place_meeting(x + hsp, y, obj_wall || obj_GravBlock))
    {
         while(!place_meeting(x + sign(hsp), y, obj_wall)) and sprite_index = spr_enemy
         {
            x += sign(hsp);
         }
         hsp = 0
         dir *= -1
    }
//Movement through lava
if (place_meeting(x, y, obj_lava))
    {
        vsp = (vsp / 1.1);
    }
    if (place_meeting(x, y, obj_lava))
    {
       hsp = (hsp / 3);
    }
x += hsp;
  
//Vertical Collision

if (place_meeting(x, y + vsp, obj_wall || obj_GravBlock)) and sprite_index = spr_enemy
    {
    while(!place_meeting(x, y + sign(vsp), obj_wall))
        {
            y += sign(vsp);
        }
        vsp = 0
    }

y += vsp;

//Enemy Collision
if (place_meeting(x, y, obj_player)) 
{
        if (obj_player.y < y-16)
        {
            with (obj_player) vsp = -jumpspeed;
            sprite_index = spr_EnemyDead;
        }
        else
        {
            game_restart();
        }
    
}
else
    {
        sprite_index = spr_enemy;
    }

if sprite_index = spr_EnemyDead
    {
        hsp = 0;
        vsp = 2;
    }

if (image_index != 1) and (move != 0) {
  if move = 1 then image_index = 0;
  if move = -1 then image_index = 2;
}