Originally Posted by
Professor-Alex
I have come across situations where a dormant thread has been bumped with a new post which is completely relevant to the conversation, and the thread continue as if there had been no time gap at all. The example that stays in my head was in the runescape section where someone made a picture out of dropped ashes and suggested he might make more, than three weeks or so later posted a new one in the same thread. In that case, I see no harm in letting the thread continue.
But as you say, these situations are rare and common sense has to prevail when deciding whether it's justified or not.