What does Acts 23:24 mean?

Despite his three-day investigation, the Roman tribune in Jerusalem cannot discover why a group of men attacked a man named Paul in the temple, dragged him out into the courtyard, and started beating him (Acts 21:27–32). Now, he's learned the religious leaders of the Jews have conspired with forty others to assassinate this man (Acts 23:16–22). The tribune—Lysias—is charged with keeping the peace in Jerusalem. If his soldiers resort to violence to keep one man—a Roman citizen—safe from the national leaders, he will have failed. He resolves to send Paul to Governor Felix in Caesarea Maritima on the Samarian coast. To make sure he gets there, Lysias sends an escort of two hundred soldiers and two hundred spearmen to ride the first forty-two–mile leg to Antipatris and seventy horsemen who will take Paul all the way to Caesarea. Further, they will leave at nine that night (Acts 23:23).

Marcus Antonius Felix, the governor, is an interesting individual. He had been a slave and some say this led to his cruel and licentious behavior as a government official. He is unfair to Paul; despite the fact Paul's accusers offer no legitimate charge against him (Acts 24:1–9), Felix keeps Paul under house arrest until he is replaced by Festus. He does this in part as a favor to the Jews and in part in hopes that Paul will offer him a bribe. He does give Paul some liberty and allows his friends to care for him (Acts 24:23, 26–27).