Program: 133849
Project: 133849
Buggy source:
private void rotateTornado(){
  origin=player.getTargetBlock((HashSet<Material>)null,(int)range).getLocation();
  double timefactor=currentHeight / maxHeight;
  currentRadius=timefactor * radius;
  if (origin.getBlock().getType() != Material.AIR && origin.getBlock().getType() != Material.BARRIER) {
    origin.setY(origin.getY() - 1. / 10. * currentHeight);
    for (    Entity entity : GeneralMethods.getEntitiesAroundPoint(origin,currentHeight)) {
      if (GeneralMethods.isRegionProtectedFromBuild(this,entity.getLocation())) {
        continue;
      }
      double y=entity.getLocation().getY();
      double factor;
      if (y > origin.getY() && y < origin.getY() + currentHeight) {
        factor=(y - origin.getY()) / currentHeight;
        Location testloc=new Location(origin.getWorld(),origin.getX(),y,origin.getZ());
        if (testloc.distance(entity.getLocation()) < currentRadius * factor) {
          double x, z, vx, vz, mag;
          double angle=100;
          double vy=0.7 * npcPushFactor;
          angle=Math.toRadians(angle);
          x=entity.getLocation().getX() - origin.getX();
          z=entity.getLocation().getZ() - origin.getZ();
          mag=Math.sqrt(x * x + z * z);
          vx=(x * Math.cos(angle) - z * Math.sin(angle)) / mag;
          vz=(x * Math.sin(angle) + z * Math.cos(angle)) / mag;
          if (entity instanceof Player) {
            vy=0.05 * playerPushFactor;
          }
          if (entity.getEntityId() == player.getEntityId()) {
            Vector direction=player.getEyeLocation().getDirection().clone().normalize();
            vx=direction.getX();
            vz=direction.getZ();
            Location playerloc=player.getLocation();
            double py=playerloc.getY();
            double oy=origin.getY();
            double dy=py - oy;
            if (dy >= currentHeight * .95) {
              vy=0;
            }
 else             if (dy >= currentHeight * .85) {
              vy=6.0 * (.95 - dy / currentHeight);
            }
 else {
              vy=.6;
            }
          }
          if (entity instanceof Player) {
            if (Commands.invincible.contains(((Player)entity).getName())) {
              continue;
            }
          }
          Vector velocity=entity.getVelocity();
          velocity.setX(vx);
          velocity.setZ(vz);
          velocity.setY(vy);
          velocity.multiply(timefactor);
          GeneralMethods.setVelocity(entity,velocity);
          entity.setFallDistance(0);
          breakBreathbendingHold(entity);
          if (entity instanceof Player) {
            new Flight((Player)entity);
          }
        }
      }
    }
    for (    int i : angles.keySet()) {
      double x, y, z, factor;
      double angle=(double)angles.get(i);
      angle=Math.toRadians(angle);
      y=origin.getY() + timefactor * (double)i;
      factor=(double)i / currentHeight;
      x=origin.getX() + timefactor * factor * currentRadius* Math.cos(angle);
      z=origin.getZ() + timefactor * factor * currentRadius* Math.sin(angle);
      Location effect=new Location(origin.getWorld(),x,y,z);
      if (!GeneralMethods.isRegionProtectedFromBuild(this,effect)) {
        playAirbendingParticles(effect,particleCount);
        if (random.nextInt(20) == 0) {
          playAirbendingSound(effect);
        }
      }
      angles.put(i,angles.get(i) + 25 * (int)speed);
    }
  }
  currentHeight=currentHeight > maxHeight ? maxHeight : currentHeight + 1;
}

Fixed version (ground truth):
private void rotateTornado(){
  origin=player.getTargetBlock((HashSet<Material>)null,(int)range).getLocation();
  double timefactor=currentHeight / maxHeight;
  currentRadius=timefactor * radius;
  if (origin.getBlock().getType() != Material.AIR && origin.getBlock().getType() != Material.BARRIER) {
    origin.setY(origin.getY() - 1. / 10. * currentHeight);
    for (    Entity entity : GeneralMethods.getEntitiesAroundPoint(origin,currentHeight)) {
      if (GeneralMethods.isRegionProtectedFromBuild(this,entity.getLocation())) {
        continue;
      }
      double y=entity.getLocation().getY();
      double factor;
      if (y > origin.getY() && y < origin.getY() + currentHeight) {
        factor=(y - origin.getY()) / currentHeight;
        Location testloc=new Location(origin.getWorld(),origin.getX(),y,origin.getZ());
        if (testloc.getWorld().equals(entity.getWorld()) && testloc.distance(entity.getLocation()) < currentRadius * factor) {
          double x, z, vx, vz, mag;
          double angle=100;
          double vy=0.7 * npcPushFactor;
          angle=Math.toRadians(angle);
          x=entity.getLocation().getX() - origin.getX();
          z=entity.getLocation().getZ() - origin.getZ();
          mag=Math.sqrt(x * x + z * z);
          vx=(x * Math.cos(angle) - z * Math.sin(angle)) / mag;
          vz=(x * Math.sin(angle) + z * Math.cos(angle)) / mag;
          if (entity instanceof Player) {
            vy=0.05 * playerPushFactor;
          }
          if (entity.getEntityId() == player.getEntityId()) {
            Vector direction=player.getEyeLocation().getDirection().clone().normalize();
            vx=direction.getX();
            vz=direction.getZ();
            Location playerloc=player.getLocation();
            double py=playerloc.getY();
            double oy=origin.getY();
            double dy=py - oy;
            if (dy >= currentHeight * .95) {
              vy=0;
            }
 else             if (dy >= currentHeight * .85) {
              vy=6.0 * (.95 - dy / currentHeight);
            }
 else {
              vy=.6;
            }
          }
          if (entity instanceof Player) {
            if (Commands.invincible.contains(((Player)entity).getName())) {
              continue;
            }
          }
          Vector velocity=entity.getVelocity();
          velocity.setX(vx);
          velocity.setZ(vz);
          velocity.setY(vy);
          velocity.multiply(timefactor);
          GeneralMethods.setVelocity(entity,velocity);
          entity.setFallDistance(0);
          breakBreathbendingHold(entity);
          if (entity instanceof Player) {
            new Flight((Player)entity);
          }
        }
      }
    }
    for (    int i : angles.keySet()) {
      double x, y, z, factor;
      double angle=(double)angles.get(i);
      angle=Math.toRadians(angle);
      y=origin.getY() + timefactor * (double)i;
      factor=(double)i / currentHeight;
      x=origin.getX() + timefactor * factor * currentRadius* Math.cos(angle);
      z=origin.getZ() + timefactor * factor * currentRadius* Math.sin(angle);
      Location effect=new Location(origin.getWorld(),x,y,z);
      if (!GeneralMethods.isRegionProtectedFromBuild(this,effect)) {
        playAirbendingParticles(effect,particleCount);
        if (random.nextInt(20) == 0) {
          playAirbendingSound(effect);
        }
      }
      angles.put(i,angles.get(i) + 25 * (int)speed);
    }
  }
  currentHeight=currentHeight > maxHeight ? maxHeight : currentHeight + 1;
}