Recently, I've been very careful about following all the rules in Super User.
Yesterday I answered a question, which after a few hours was marked "On Hold", as a duplicate of another one. Before I posted my own answer, I saw that the "Possible Duplicate" question had an accepted answer, but it was marked "Closed", so I went ahead and wrote my own answer to the question that was still open.
Should I be careful before answering a question with a "Possible Duplicate" that is marked as "On Hold" or "Closed"? Should I search for related ones to flag it as a duplicate if neccesary?
P.S.: I asked this question because I want to make sure I'm doing things the right way.
Original Question is this:
And Related One was closed: