Program: 133901
Project: 133901
Buggy source:
@EventHandler(priority=EventPriority.NORMAL,ignoreCancelled=true) public void onPlayerDamage(EntityDamageEvent event){
  if (event.isCancelled()) {
    return;
  }
  if (event.getEntity() instanceof Player) {
    Player player=(Player)event.getEntity();
    BendingPlayer bPlayer=BendingPlayer.getBendingPlayer(player);
    if (bPlayer == null) {
      return;
    }
    if (bPlayer.hasElement(Element.EARTH) && event.getCause() == DamageCause.FALL) {
      new Shockwave(player,true);
    }
    if (!event.isCancelled() && bPlayer.hasElement(Element.AIR) && event.getCause() == DamageCause.FALL && bPlayer.canBendPassive(Element.AIR)) {
      new AirBurst(player,true);
      event.setDamage(0D);
      event.setCancelled(true);
    }
    if (!event.isCancelled() && bPlayer.hasElement(Element.WATER) && event.getCause() == DamageCause.FALL && bPlayer.canBendPassive(Element.WATER)) {
      if (WaterPassive.applyNoFall(player)) {
        event.setDamage(0D);
        event.setCancelled(true);
      }
    }
    if (!event.isCancelled() && bPlayer.hasElement(Element.EARTH) && event.getCause() == DamageCause.FALL && bPlayer.canBendPassive(Element.EARTH)) {
      if (EarthPassive.softenLanding(player)) {
        event.setDamage(0D);
        event.setCancelled(true);
      }
    }
    if (!event.isCancelled() && bPlayer.hasElement(Element.CHI) && event.getCause() == DamageCause.FALL && bPlayer.canBendPassive(Element.CHI)) {
      if (player.isSprinting()) {
        event.setDamage(0);
        event.setCancelled(true);
      }
 else {
        double initdamage=event.getDamage();
        double newdamage=event.getDamage() * ChiPassive.getFallReductionFactor();
        double finaldamage=initdamage - newdamage;
        event.setDamage(finaldamage);
      }
    }
    if (!event.isCancelled() && event.getCause() == DamageCause.FALL) {
      Player source=Flight.getLaunchedBy(player);
      if (source != null) {
        event.setCancelled(true);
      }
    }
    if (bPlayer.canBendPassive(Element.FIRE) && bPlayer.hasElement(Element.FIRE) && (event.getCause() == DamageCause.FIRE || event.getCause() == DamageCause.FIRE_TICK)) {
      event.setCancelled(!HeatControlExtinguish.canBurn(player));
    }
    if (bPlayer.hasElement(Element.EARTH) && event.getCause() == DamageCause.SUFFOCATION && TempBlock.isTempBlock(player.getEyeLocation().getBlock())) {
      event.setDamage(0D);
      event.setCancelled(true);
    }
  }
}

Fixed version (ground truth):
@EventHandler(priority=EventPriority.NORMAL,ignoreCancelled=true) public void onPlayerDamage(EntityDamageEvent event){
  if (event.isCancelled()) {
    return;
  }
  if (event.getEntity() instanceof Player) {
    Player player=(Player)event.getEntity();
    BendingPlayer bPlayer=BendingPlayer.getBendingPlayer(player);
    if (bPlayer == null) {
      return;
    }
    if (bPlayer.hasElement(Element.EARTH) && event.getCause() == DamageCause.FALL) {
      new Shockwave(player,true);
    }
    if (!event.isCancelled() && bPlayer.hasElement(Element.AIR) && event.getCause() == DamageCause.FALL && bPlayer.canBendPassive(Element.AIR)) {
      new AirBurst(player,true);
      event.setDamage(0D);
      event.setCancelled(true);
    }
    if (!event.isCancelled() && bPlayer.hasElement(Element.WATER) && event.getCause() == DamageCause.FALL && bPlayer.canBendPassive(Element.WATER)) {
      if (WaterPassive.applyNoFall(player)) {
        event.setDamage(0D);
        event.setCancelled(true);
      }
    }
    if (!event.isCancelled() && bPlayer.hasElement(Element.EARTH) && event.getCause() == DamageCause.FALL && bPlayer.canBendPassive(Element.EARTH)) {
      if (EarthPassive.softenLanding(player)) {
        event.setDamage(0D);
        event.setCancelled(true);
      }
    }
    if (!event.isCancelled() && bPlayer.hasElement(Element.CHI) && event.getCause() == DamageCause.FALL && bPlayer.canBendPassive(Element.CHI)) {
      double initdamage=event.getDamage();
      double newdamage=event.getDamage() * ChiPassive.getFallReductionFactor();
      double finaldamage=initdamage - newdamage;
      event.setDamage(finaldamage);
    }
    if (!event.isCancelled() && event.getCause() == DamageCause.FALL) {
      Player source=Flight.getLaunchedBy(player);
      if (source != null) {
        event.setCancelled(true);
      }
    }
    if (bPlayer.canBendPassive(Element.FIRE) && bPlayer.hasElement(Element.FIRE) && (event.getCause() == DamageCause.FIRE || event.getCause() == DamageCause.FIRE_TICK)) {
      event.setCancelled(!HeatControlExtinguish.canBurn(player));
    }
    if (bPlayer.hasElement(Element.EARTH) && event.getCause() == DamageCause.SUFFOCATION && TempBlock.isTempBlock(player.getEyeLocation().getBlock())) {
      event.setDamage(0D);
      event.setCancelled(true);
    }
  }
}