Greetings, [fullname]. You've caused our group a lot of trouble lately. We won't tolerate your actions for long. Stay away from our group, or we'll make you regret you ever messed with us.
To [fullname]. Did you think you could get away with the things you've done to our group, [group]? This is the first and last warning. Do any harm to any of our trolls, and we'll behead you.
From [group] to [fullname]. You've caused a lot of headache to our group with your recent acts. Make sure you never harm anyone of our group again, or your life will come to a sudden end.