Problem bit of Minecraft Code

public void sendChunkUpdate()
{
  if (this.numberOfTilesToUpdate != 0)
  {
    int i;
    int j;
    int k;

    if (this.numberOfTilesToUpdate == 1)
    {
      i = this.chunkLocation.chunkXPos * 16 + (this.locationOfBlockChange[0] >> 12 & 15);
      j = this.locationOfBlockChange[0] & 255;
      k = this.chunkLocation.chunkZPos * 16 + (this.locationOfBlockChange[0] >> 8 & 15);
      this.sendToAllPlayersWatchingChunk(new S23PacketBlockChange(i, j, k, PlayerManager.this.theWorldServer));

      if (PlayerManager.this.theWorldServer.getBlock(i, j, k).hasTileEntity(PlayerManager.this.theWorldServer.getBlockMetadata(i, j, k)))
      {
        this.sendTileToAllPlayersWatchingChunk(PlayerManager.this.theWorldServer.getTileEntity(i, j, k));
      }
    }
    else
    {
      int l;

      if (this.numberOfTilesToUpdate == net.minecraftforge.common.ForgeModContainer.clumpingThreshold)
      {
        i = this.chunkLocation.chunkXPos * 16;
        j = this.chunkLocation.chunkZPos * 16;
        this.sendToAllPlayersWatchingChunk(new S21PacketChunkData(PlayerManager.this.theWorldServer.getChunkFromChunkCoords(this.chunkLocation.chunkXPos, this.chunkLocation.chunkZPos), false, this.flagsYAreasToUpdate));

        // Forge: Grabs ALL tile entities is costly on a modded server, only send needed ones
        for (k = 0; false && k < 16; ++k)
        {
          if ((this.flagsYAreasToUpdate & 1 << k) != 0)
          {
            l = k << 4;
            List list = PlayerManager.this.theWorldServer.func_147486_a(i, l, j, i + 16, l + 16, j + 16);

            for (int i1 = 0; i1 < list.size(); ++i1)
            {
              this.sendTileToAllPlayersWatchingChunk((TileEntity)list.get(i1));
            }
          }
        }
      }
      else
      {
        this.sendToAllPlayersWatchingChunk(new S22PacketMultiBlockChange(this.numberOfTilesToUpdate, this.locationOfBlockChange, PlayerManager.this.theWorldServer.getChunkFromChunkCoords(this.chunkLocation.chunkXPos, this.chunkLocation.chunkZPos)));
      }

      { //Forge: Send only the tile entities that are updated, Adding this brace lets us keep the indent and the patch small
        WorldServer world = PlayerManager.this.theWorldServer;
        for (i = 0; i < this.numberOfTilesToUpdate; ++i)
        {
          j = this.chunkLocation.chunkXPos * 16 + (this.locationOfBlockChange[i] >> 12 & 15);
          k = this.locationOfBlockChange[i] & 255;
          l = this.chunkLocation.chunkZPos * 16 + (this.locationOfBlockChange[i] >> 8 & 15);

          if (world.getBlock(j, k, l).hasTileEntity(world.getBlockMetadata(j, k, l)))
          {
            this.sendTileToAllPlayersWatchingChunk(PlayerManager.this.theWorldServer.getTileEntity(j, k, l));
          }
        }
      }
    }
    this.numberOfTilesToUpdate = 0;
    this.flagsYAreasToUpdate = 0;
  }
}