Paul and Barnabas are attracting huge crowds in Antioch and also jealousy from the religious leaders. This prompts Paul and Barnabas to switch tacts and preach the Good News to the pagans who received it with great joy.
What on the outside appears to be a defeat (expulsion from Antioch) is received by the disciples as a cause for great joy. The Church continues to grow with gentile converts adding to their numbers. The proclaimed Good News is irrepressible. In its wake flows disciples "filled with joy and the Holy Spirit" Acts.13:52.