this one guy 'grabbed' my girlfriend. so once i found him again i walked up to him and headbutted his nose. then i grabbed his head and kneed him in the face. he tried to come forward and grab my legs to take me down, but he was so loppy and 'out of it' so i just backed up and fell on top of coming down with a full force elbow to the back of his head. im not proud of what i did or anything, but it was the first time i had KO'd somebody.