This depends. If this is the same county, the sheriff could take you to the court on your court date. Otherwise, yes- you will have a warrant and potentially a probation violation for failure to pay your fine. Court is important, pay the fines and do what they ask. Otherwise you could wind up doing a significant jail stay.
These are serious charges. He can't just pay and pretend nothing happened. The judge is likely going to want him present to explain why he failed to appear. Having a bail bondsman on call would be a good idea.