My "semester" just ended, and it would seem there were no major casualties from that aforementioned grenade. Things were a bit tense, but the gentleman in question gave up emailing me after I gave him my final word on the matter (which was "It's my class, and if you don't like it, you can complain to the dean") and ended up with a decent grade despite his antisocial behavior on this point. I do think he's making some kind of complaint about me, or maybe just giving me a bad course evaluation, but frankly I don't much care; my dean already knows this whole story, and I have the entire conversation saved on my computer if I need to pull it out.
I'm just glad it's over. I felt guilty, because I know it could have been a better class than it was.... if I teach online again, I'll be far better at it. But there were some good elements to online as opposed to F2F lecturing, too. If I ever do the latter again, I may try to find ways to apply some of the discussion techniques I used in the online class (minus the crazy angry guy, of course.)
I'd go on further about little things, like how amazing the lightning bugs in my yard look tonight and every night in June.... But I'm tired, and I keep mistyping. So it's off to bed instead.