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Is Tactical Down-Voting ever valid?
How does this work? In a high-pace situation (question, minutes old, currently does not have satisfactory answer), are answerers obligated to read all other answers before and as they're answering, and follow every single revisions of those answers, just in case someone else already said the "same thing" as they're about to say, and make sure to credit those answers else he/she should be downvoted for the perceived stealing?
Let's say there are two answerers A and B on the same question, and they revised their answers progressively, A1, B1, A2, A3, B2, etc. At some point, let's say B4 was derived, and later, say, A5 chronologically followed, which happens to be "the same as" B4.
Should B downvote A5 for "stealing" or otherwise not crediting B4?
[discussion]
on meta. B in fact later retracted the downvote (after making a dummy A6 revision on A's answer), so A (=me) is not really concerned about that "tactical" downvote (which no longer exists), but rather the issue of proper credit when answers are being revised, etc.