if (sendClientUpdate) {
sendClientUpdate = false;
if (worldObj instanceof WorldServer) {
WorldServer world = (WorldServer) worldObj;
BuildCraftPacket updatePacket = getBCDescriptionPacket();
for (Object o : world.playerEntities) {
EntityPlayerMP player = (EntityPlayerMP) o;
if (world.getPlayerManager().isPlayerWatchingChunk (player, xCoord >> 4, zCoord >> 4)) {