General_Pafkov
There is a justified lolnope at some point, when the enemy gets too op and for example attacks your homeworld without any reason except for that he can, nobody will judge you if you just say: "hey, Stop, this is my event, and you will not do that, that is too op!"
The way I did it, and this has worked out very well for more than half a year by now, is just to say what I shoot at them, and let them determine the damage. Most players are fair enough.