@toxtethogrady @jwz
The other user still existed, as did their reply, you just didn't see either one. On Twitter, blocking merely kept you from seeing each other, and them from replying to you personally-- but they could still reply within your thread to others who replied there.

I kept a second Twitter account (bot) for many years, just so I could view posts from accounts that had blocked me or whom I had blocked, in case it should have ever became necessary (which it did, more than a few times). Conversations did carry on in reply to accounts which were blocked from mine, but which had commented on my original tweet.

@AnneTheWriter1 @jwz I decided to live in blissful ignorance😎 If I had any reason to see anything posted by anyone who'd blocked me, I would have tried those workarounds, but it was never worth my effort. Meanwhile, I never blocked anyone. My facts were always better than theirs, my sources could always be cited and my wit was always twice theirs...

"Not twice mine..."