Now I can't replicate it -- I should grumble, but no bug is a good thing. If I encounter the phenomenon again, I'll upload a savegame. Sorry for wasting your time, Pyros.
First of all, any feedback is welcomed and you aren't wasting my time.
Secondly, the first time I tried to confirm your remark, (I think) that I also experienced the same "rocket artillery" issue, but since then... I haven't been able to reproduce it.