Can "revert damage inflicted" be used in a letter to a friend? Would it sound too official? If yes, what phrase would you use instead of the high-lightened one below?
Not only did he type all kinds of nonsense and clicked on "Sent" button a few times on that page, he even tried browsing some others forums where I am a member and "provided some input" there too. I did punish him when I came back, but punishing him didn't revert all the damage inflicted.