Program: 133848
Project: 133848
Buggy source:
@Override public void progress(){
  for (int i=0; i < targets.size(); i++) {
    LivingEntity target=targets.get(i);
    if (target.isDead() || !target.getWorld().equals(player.getWorld()) || target.getLocation().distanceSquared(player.getEyeLocation()) > range * range || GeneralMethods.isRegionProtectedFromBuild(this,target.getLocation())) {
      breakSuffocateLocal(target);
      i--;
    }
 else     if (target instanceof Player) {
      Player targPlayer=(Player)target;
      if (!targPlayer.isOnline()) {
        breakSuffocateLocal(target);
        i--;
      }
    }
  }
  if (targets.size() == 0 || !bPlayer.canBendIgnoreCooldowns(this)) {
    remove();
    return;
  }
  if (requireConstantAim) {
    double dist=player.getEyeLocation().distance(targets.get(0).getEyeLocation());
    Location targetLoc=player.getEyeLocation().clone().add(player.getEyeLocation().getDirection().normalize().multiply(dist));
    List<Entity> ents=GeneralMethods.getEntitiesAroundPoint(targetLoc,constantAimRadius);
    for (int i=0; i < targets.size(); i++) {
      LivingEntity target=targets.get(i);
      if (!ents.contains(target)) {
        breakSuffocateLocal(target);
        i--;
      }
    }
    if (targets.size() == 0) {
      remove();
      return;
    }
  }
  if (System.currentTimeMillis() - startTime < chargeTime) {
    return;
  }
 else   if (!started) {
    started=true;
    for (    LivingEntity targ : targets) {
      final LivingEntity target=targ;
      BukkitRunnable br1=new BukkitRunnable(){
        @Override public void run(){
          DamageHandler.damageEntity(target,damage,ability);
        }
      }
;
      BukkitRunnable br2=new BukkitRunnable(){
        @Override public void run(){
          target.addPotionEffect(new PotionEffect(PotionEffectType.SLOW,(int)(slowRepeat * 20),(int)slow));
        }
      }
;
      BukkitRunnable br3=new BukkitRunnable(){
        @Override public void run(){
          target.addPotionEffect(new PotionEffect(PotionEffectType.BLINDNESS,(int)(blindRepeat * 20),(int)blind));
        }
      }
;
      tasks.add(br1);
      tasks.add(br2);
      tasks.add(br3);
      br1.runTaskTimer(ProjectKorra.plugin,(long)(damageDelay * 20),(long)(damageRepeat * 20));
      br2.runTaskTimer(ProjectKorra.plugin,(long)(slowDelay * 20),(long)(slowRepeat * 20 / 0.25));
      br3.runTaskTimer(ProjectKorra.plugin,(long)(blindDelay * 20),(long)(blindRepeat * 20));
    }
  }
  animate();
  if (!player.isSneaking()) {
    remove();
    return;
  }
}

Fixed version (ground truth):
@Override public void progress(){
  for (int i=0; i < targets.size(); i++) {
    LivingEntity target=targets.get(i);
    if (target.isDead() || !target.getWorld().equals(player.getWorld()) || target.getLocation().distanceSquared(player.getEyeLocation()) > range * range || GeneralMethods.isRegionProtectedFromBuild(this,target.getLocation())) {
      breakSuffocateLocal(target);
      i--;
    }
 else     if (target instanceof Player) {
      Player targPlayer=(Player)target;
      if (!targPlayer.isOnline()) {
        breakSuffocateLocal(target);
        i--;
      }
    }
  }
  if (targets.size() == 0 || !bPlayer.canBendIgnoreCooldowns(this)) {
    remove();
    return;
  }
  if (requireConstantAim) {
    double dist=0;
    if (player.getWorld().equals(targets.get(0).getWorld())) {
      dist=player.getEyeLocation().distance(targets.get(0).getEyeLocation());
    }
    Location targetLoc=player.getEyeLocation().clone().add(player.getEyeLocation().getDirection().normalize().multiply(dist));
    List<Entity> ents=GeneralMethods.getEntitiesAroundPoint(targetLoc,constantAimRadius);
    for (int i=0; i < targets.size(); i++) {
      LivingEntity target=targets.get(i);
      if (!ents.contains(target)) {
        breakSuffocateLocal(target);
        i--;
      }
    }
    if (targets.size() == 0) {
      remove();
      return;
    }
  }
  if (System.currentTimeMillis() - startTime < chargeTime) {
    return;
  }
 else   if (!started) {
    started=true;
    for (    LivingEntity targ : targets) {
      final LivingEntity target=targ;
      BukkitRunnable br1=new BukkitRunnable(){
        @Override public void run(){
          DamageHandler.damageEntity(target,damage,ability);
        }
      }
;
      BukkitRunnable br2=new BukkitRunnable(){
        @Override public void run(){
          target.addPotionEffect(new PotionEffect(PotionEffectType.SLOW,(int)(slowRepeat * 20),(int)slow));
        }
      }
;
      BukkitRunnable br3=new BukkitRunnable(){
        @Override public void run(){
          target.addPotionEffect(new PotionEffect(PotionEffectType.BLINDNESS,(int)(blindRepeat * 20),(int)blind));
        }
      }
;
      tasks.add(br1);
      tasks.add(br2);
      tasks.add(br3);
      br1.runTaskTimer(ProjectKorra.plugin,(long)(damageDelay * 20),(long)(damageRepeat * 20));
      br2.runTaskTimer(ProjectKorra.plugin,(long)(slowDelay * 20),(long)(slowRepeat * 20 / 0.25));
      br3.runTaskTimer(ProjectKorra.plugin,(long)(blindDelay * 20),(long)(blindRepeat * 20));
    }
  }
  animate();
  if (!player.isSneaking()) {
    remove();
    return;
  }
}