If the defendant fulfills their obligation to appear in court, the bail bond company recovers the full amount of the bond. Conversely, if the defendant fails to appear, the bail bond company loses this amount, and the defendant may be liable for the financial loss incurred by the bond company.
You can withdrawl your agreement by calling the bondsman and telling them that you no longer want to be on the bond as you feel the ``criminal'' will not show up to court. You can sign off of the bail but they may arrest your friend.