By default quorum is 50% + 1Vote and with 2 nodes to have quorum you need 2 votes.
Yet in a two node cluster - you want to have quorum even with 1 node, so there is a special option "two_node:1" which tells that (we need only 1 vote to survive) to pacemaker.
Thanks for the explanation. Understood the point.

So ,in your case you need the "two_node:1" and
set a proper stonith device (no matter sbd or other)
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Can you please help me implement the fencing mechanism which doesnt shoot down the node but just stops the services that I want.