“Come now.” For this translation compare Anchor Bible Commentary (Joseph Fitzmyer). NASB, HCSB, and KJV translate the oun (#3767 οὖν) as “therefore.” But “therefore” normally indicates the practical application of that which came before, which makes no sense in this context; rather, this is a continuation of narrative, a logical connection, not properly the practical application. “Come now” captures this sense well.