In this chapter Paul is describing his conversion and his commission by Christ Himself. This is what we have in Acts 9. Paul is telling this as he is given permission to speak to the Jews. However these are not willing to listen. They could be considered a hostile crowd. Now we know something about hostile crowds today. How much reasoning can be done with a crowd like that? I don’t know whether one salvation is recorded since Paul got to Jerusalem. Perhaps it could be said of the Chief Captain but I can’t be certain.
Since Paul got to Jerusalem he was persuaded to go into the temple to carry out a vow which was contrary to what he preached against previously. If it would have been carried out it would have received his previous work. God sometimes stops us when necessary to prevent ruin of our previous work.