how is that possible? realistic siege on, and lost city with 80% defenses and walls

[tramwajg]

hey, how is it possible that with realistic siege on, I loose the weakest unit in city defended by swordsman? attached save, picture 1 is one turn after loosing apothecary, so that I went outside with swordsman to try killing invisible unit, which then entered city with 80% defense and captured it, even though city had walls given for free by hadrian's walls, and attackers are supposed to not be able to enter until defense has fallen to 60% (picture 3), also, any ideas why swordsman wasn't the main defender and first battle was with weak apothecary instead? adding save too

 

[Thunderbrd]

It's likely that the finer nuances of the special targeting system are being ignored here after a rewrite. Nothing to do with realistic siege I'd expect.