[Pacemaker] why dead node bring back ?

[Mars gu]

Hi all,
      my cluster is corosync-2.0.1(used votequorum) and pacemaker-1.1.7(come from fedora 17).  There are three nodes in it (h10_147,h10_148,h10_149).
     I executed the following CLI  on  h10_147.
               /etc/init.d/pacemaker stop
               /etc/init.d/corosync stop
 
     then I executed other CLI on h10_148 to delete the node h10_147
             crm node delete h10_147
          
     So, I find h10_147 disappeared in cluster by the CLI "crm status"
********************************************************************************************                
Stack: corosync
Current DC: h10_149 (353020096) - partition with quorum
Version: 1.1.7-1.el6-ee0730e13d124c3d58f00016c3376a1de5323cff
2 Nodes configured, unknown expected votes
6 Resources configured.
============
Online: [ h10_149 h10_148 ]
**********************************************************************************************
 
 
 So far, all the state is correct, but the strange problem will happen next.
  I executed the following CLI on h10_148 to try to delete h10_148.
        /etc/init.d/pacemaker stop
       /etc/init.d/corosync stop
when I want to delete h10_148 on h10_149 ,  I find that the node h10_147 bring back to life in cluster. 
***************************************************************** 
3 Nodes configured, unknown expected votes
6 Resources configured.
============
Online: [ h10_149 ]
OFFLINE: [ h10_147  h10_148 ]
***************************************************************
 what is the reason of this problem ?
 
Best Regards,
Mars Gu
 
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