I would add what mercuryus suggested plus change the order of the instructions a little bit:
Code:

---

if(level_code == 1)
{
  var hdl;
  freeze_mode = 1;
  
  hdl = media_play("level2b.avi",null,50);
  while(media_play(hdl) == on) { wait(1); }

  level_load("level2b.wmb");
  wait(3);

  p1_health = 100;
  player.health = 100;
  level_code = 2.2;

  freeze_mode = 0;
  AIpath();
}

---