So this is going to come up: in first edition, there were two different timings for removing destroyed ships. Most of the time the ships were removed during the attack that destroyed them, but sometimes a ship would be kept around by Simultaneous Fire.
Now any ship that's destroyed during the Engagement phase for any reason hangs around until the end of the current initiative step. Most of the time this won't matter, but for ships with passive defensive abilities like Serissu or Biggs , it'll mean you can't clear them out of the way with the first of multiple same-initiative attacks.
This is about rules, but it's not a question, so let me postscript this with: when measuring with a ruler, I learned to start from the 1 mark rather than the end of the ruler, because it's less precise (the marks might be misaligned, the end of the ruler might have worn down, etc). I had a bunch of off-by-one errors early on, but now I barely think about it. Anybody else do that?