The rules as you have explained are NOT written clearly....You still have not shown in Rules where you claim it says you can keep attacking the Uncap until that person is Dead (you can't show this, because this is not included in the rules...it is only your undocumented incorrect understanding of your own rules)....
again, the way you have written the rules, you can only attack Uncap if they are firing from Uncap....if you Destroy the thing that was attacking from Uncap, then you can only attack Uncap if another incident of firing from uncap occurs...the 1st occurrence allowed you to destroy what was firing from uncap, if they don't fire after you destroyed what was firing from Uncap, then you can't further attack the Uncap, because you are not being fired upon from the Uncap, (if you are not being fired upon from uncap because you already destroyed the mortar, WHAT at this point, what fire are you returning....None)....also, at this point you are just attacking the Uncap without being fired Upon.
Look, all you need to say is,
1)Major you are correct and we will modify our rules or
2) Major is correct and we had it WRONG all these years, from now on you can't attack Uncap after you destroyed the item that let you attack uncap in the 1st palce....you must wait for a 2nd occurace of firing from Uncap to attack uncap a 2nd time.....Then you rules will be clearly written, your' welcome!