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The answer is yes. Attorneys talk very often outside of work, and it is not uncommon for an attorney who no longer represents a party to continue a professional relationship with the other attorney. Also attorneys can remain friends after a suit is over.
However, that Plaintiff's attorney still has the duty to their former client not to state anything that would HURT their former client in the case. See HERE (Rule 1.9). So corresponding with the attorney is okay. But their conversations are limited in that the attorney cannot hurt a former client by disclosing something about the case.
The vast majority of attorneys are very conscious of these rules and are ethical, despite what television pundits claim. So likely, the conversation is no cause for concern.
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