Does joining in bullying, then stopping and reporting it, still make you a bully?

If several years ago (you were in HS back then), you were initially participating but then upon seeing your friends going too far, you start feeling sorry for the person, you're telling others that it's enough now but they aren't stopping. Then you walked away in total disgust and later on report them, risking your own popular reputation. Are you still a bully since you initially did joined in the taunting? It's that they were a lot meaner and cruel than you... and at some point they disgusted you. For instance you were just into giving the person a nickname, telling sarcastic things but would've never gone far to tell someone that it would be better if they kill themselves nor made jokes about their mother surviving breast cancer nor other truly cruel things.

Does joining in bullying, then stopping and reporting it, still make you a bully?
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