are you living in Flat(thread)land, where Anna was responding to Marty (?) not to Avy, but you couldn't tell?

Yes, I stay in flat mode. This is the way I (unknowingly)
started, and this is what I'm used to. I like to see the actual posts--a bunch of headings-only just is kind of meaningless to me. I didn't realize this might cause a problem referencing. Anna's is posted right under Avy's.