Your current ns is used for server 1 if you remove that ns record to then assign it to server 2 then server 1 will fail. As it will no longer have the ns record. You need that ns record on server 1 untill all domains on server1 propagate over to server 2.
So the only way around it is to use another pair of ns record on server 2 or cluster server 1 and server 2 to use identical ns records untill everythings propagated.
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