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How does coordinator know the device leave the network?

Hello everyone.

I have 3 device, 1 ZC, 1ZR and 1 ZED.

ZR's parent is ZC and ZED's parent is ZR. ( ZC <-- ZR <-- ZED).

Devices use NLME_LeaveReq( &req ) to leave the the network. 

req.extAddr = NULL;
req.removeChildren = TRUE;
req.rejoin = FALSE;
req.silent = FALSE;

ZC can get ZDO_LEAVE_IND when ZR leave the network.

But ZC can't get ZDO_LEAVE_IND  when ZED leave the net work.

How does coordinator know ZED leave the network?

Can I get the message like ZDO_LEAVE_IND?