[KingKold]

i have sent a picture about the dialogue
there you can see the threat
its in german
so in english he said
if you post a report about HarryPotter i will make life miserable for you
thats a good reason to ban him

[shadows]

Just ignore him. People says to many things over the net and think they are tough.
Put the person on block also in pm. Then you wont have any problems with him. Threats are the easy way to do over the net and its pathetic. It just gives you the idea, that a person like him is just another big idiot.
And yeah sure, would be nice if navmesh could give him a warning for it.

[KingKold]

yes a warning is at least all what i want

[vladdidar]

I doubt you will even get a warning.
Add him to your ignore list and simply move on with life.