JMNT(i)
19 Now he came to be (= spent some time) with the disciples in Damascus [for] some (or: certain; [p45 reads: enough]) days,
20 then straightway (at once) began publicly proclaiming Jesus within the synagogues – continuously heralding that this Man is (exists being) God's Son (or: the Son which has the character and qualities of, and whose origin is, God)!
21 Yet all the folks presently listening and hearing [him] continued amazed and astonished (literally: standing out of themselves), and were one after another saying, "Is not this man the person [who] in Jerusalem was laying waste (devastating; ravaging; trying to kill) the people habitually calling upon this Name? And now he has come here, into this place (or: unto this purpose), so that after [their] having been bound, he could lead them on to the head (chief; ranking) priests!"
22 But Saul kept on being more exceedingly empowered and was progressively given inner abilities, and so he kept on pouring [thoughts; ideas; Scriptures] together – [to the point that] he was creating an uproar among, and was confounding, the Jews presently living and permanently dwelling in Damascus – progressively causing [his arguments] to stand together, thus proving conclusively that this Man is (exists being) the Christ (the Anointed One; = the Messiah; [note: = "God's Son," of vs. 20, above]).