Please send a PM to Sports Illustrator or the mod who banned him. Since his offense was against you, and you are saying let him free, I don't see there being a problem...but I am not the guy to make these decisions. SI is the admin to contact on all user-based forum issues (bannings, mod issues, usernames, etc.)
That's fine, you didn't do anything wrong by bringing it up but I just wanted you to know that while your sentiment is appreciated it just seems that he just keeps doing these things. Hopefully he learns this time.