First, in actuality, courts don't really come come after people who co-sign on PR bonds. If you had posted a cash bond, you should be worried. I am a former judge. In 7 years of people failing to appear on PR bonds, we never pursued any of the co-signors. However, you are free to bring the person to the judge and tell the judge that you are no long willing to serve as a co-signor on the bond and see if the judge wants to leave him on a PR bond or whether the judge wants to put the person back in jail and require them to post a bond.
The information provided in this answer does not create an attorney-client relationship and is not considered to be legal advice.