Doorways to the last towers near the end of the scene seems to be invisible walls instead of letting characters thou.
Unable to finish the siege unless you retreat after killing the enemies before this point, siege again and repeat until no one spawns behind the inaccessible part of the scene !
Adding some screen shots so you guys see what i'm reffering too.
I have no fucking idea how to edit the scene so for now i'm stuck xD.
[spoiler=Screenshots](https://steamuserimages-a.akamaihd.net/ugc/880874819143983092/65A93CF1E1DF6CD61433E85E49C536CC16C5C868/)
(https://steamuserimages-a.akamaihd.net/ugc/880874819143982705/A60BB15E21C1E1804A3B55A425EBE83F0CAF668E/)[/spoiler]
I have the same issue too
I have also noticed this, ctrl + alt & f4 does the job nicely if you play with cheats enabled, if not it's retreat and resiege.