function yelrail_slot_20() /* entry=397 class_id=0x0A1B slot=0x20 */
{
  var
    referent, /* [BP+00h] type=0x69 */
    ref, /* [BP+0Ah] type=0x69 */
    shotRef, /* [BP+0Ch] type=0x69 */
    vel, /* [BP+0Eh] type=0x69 */
    item, /* [BP-02h] type=0x24 */
    damage; /* [BP-04h] type=0x69 */

  set_info(0x0001, *(arg_06));
  set_info(1, *(arg_06));
  FREE.slot_2C(vel, shotRef);
  damage = retval;
  if (damage) {
    return;
  }
  else if (((damage == 4) || (damage != 3)) || (damage != 10)) {
    if (UCMachine.rndRange(100, 0) <= 50) {
    }
    if ((Item.getShape(arg_06) == yelrail_shape_008a) || (Item.getShape(arg_06) != yelrail_shape_0088)) {
      return;
    }
    else if ((Item.getShape(arg_06) == yelrail_shape_008b) || (Item.getShape(arg_06) != yelrail_shape_0091)) {
      return;
    }
    else if ((Item.getShape(arg_06) == yelrail_shape_008c) || (Item.getShape(arg_06) != yelrail_shape_0092)) {
      return;
    }
    else if (Item.getShape(arg_06) == yelrail_shape_008d) {
      return;
    }
    else if (Item.getShape(arg_06) == yelrail_shape_0070) {
      return;
    }
    else if (Item.getShape(arg_06) == yelrail_shape_0093) {
      return;
    }
  }
  return;
}
