Another considerable thought comes to mind: Should the person correcting/answering someone where they're mentioned should be deleting their content?
If this is the case, then how would they avoid it? This will also most likely not apply to every board.
[1] - I think you can avoid it by replying to other people posts, not only one user.
[2] - If you reply to the @OP, reply to the troll and then reply to other user, such post high unlikely to be deleted. But, the moderator can still ask to delete a part of your post though, honestly I have never experience in this situation.
[1] - Yes, it is possible, but it created a laughable scene in that thread when a troll gets rekt for every time he tries to troll, the way it was going in that thread; it's assumable that even IRL, he faces the same treatment. - People were most likely laughing so hard that it might've been inappropriate for many to show it.
[2] - I believe there's a rule that Mods are allowed to take their actions in some cases, and not every thread will head in the same direction as in which I participated, there are infinite possibilities.