Most of this particular comment chain (and it's the post-Earthormjim comment chain I said was referring to that one patch, not the whole thread) has been you replying to me after I started talking about it, so it's been the topic whether or not it's a non-sequitur from the thread as a whole. When one of the participants in a two-person dialogue thinks something's the current topic, that's enough to make it the topic.