Need help implementing delays in DECORTAE

ACTOR DoomImp1 replaces DoomImp
{

  var int user_i;
  var int user_a;
  Health 60
  Radius 20
  Height 56
  Mass 100
  Speed 8
  PainChance 200
  Monster
  +FLOORCLIP
  SeeSound "imp/sight"
  PainSound "imp/pain"
  DeathSound "imp/death"
  ActiveSound "imp/active"
  HitObituary "$OB_IMPHIT"
  Obituary "$OB_IMP"
  States
  {
  Spawn:
	TROO A 0 {
	A_SetUserVar(user_i, 0);
	A_SetUserVar(user_a, 24);
	}
    TROO AB 10 A_Look
    Loop
  See:
    TROO AABBCCDD 3 A_Chase
    Loop
  Melee:
  Missile:
	TROO EF 2
	TROO F 0
	{
	while (user_i < user_a)
	{
    	A_CustomMissile("BrownImpBall",32,0,user_i*(360/user_a));
		A_SetUserVar(user_i, user_i + 1);
		//WAIT FOR 1 FRAME HERE                                            <----------------------------
	}
	A_SetUserVar(user_i, 0);	
	}
	TROO G 20
	Goto See
  Pain:
    TROO H 2
    TROO H 2 A_Pain
    Goto See
  Death:
    TROO I 8
    TROO J 8 A_Scream
    TROO K 6
    TROO L 6 A_NoBlocking
    TROO M -1
    Stop
  XDeath:
    TROO N 5
    TROO O 5 A_XScream
    TROO P 5
    TROO Q 5 A_NoBlocking
    TROO RST 5
    TROO U -1
    Stop
  Raise:
    TROO ML 8
    TROO KJI 6
    Goto See
  }
}