For future reports please read the spoiler below:
[spoiler=How to copy a nickname, if it contains Аlt-code, is in different language, or is too hard to write down:]In chat, list of nick-names in the battle ground or arena player log box. You have to shift+left click the name with open chat,
and press Ctrl+a (to select), then Ctrl+c (to copy) and Ctrl+v (in the report, to paste). Don't worry if you see question marks like those: "???????" in chat,
the nickname will be still copied the write way in the forum. Also, if there is no log box, nor the violators messages in chat, you can target him, and write in chat:
/run local name = UnitName("target");ChatFrame_OpenChat("/w "..name.." Hello.", chatFrame);
and get his nickname.
Player's name is " Зароол" and he is from x100 realm.
Banned.