Is it likely to have someone's bail revoked for citations?

I am not sure how likely it is.  It depends on what he is out on bail for.  The harassment charge is certainly worrisome and could definitely result in a revocation.  For a traffic summary, unless he is on bail for a traffic violation, then that is not usually grounds for a revocation.  The harassment, however, is problematic.  He needs to make sure his attorney is working to get ahead of this.  Judges take any sort of violent charge by bailees very seriously.