You refer to Acts 13, correct? Where the proconsul, Sergius Paulus sent for Paul & Barnabas to tell him about Christ Jesus.
You have to remember, Jesus did not do anything without the Father's directive. Neither did Paul. It said the Holy Spirit showed Paul that Elymas the Jewish sorcerer & false prophet was filled with the devil, and that he was purposely trying to thwart the Word of God being told to the proconsul.
Paul did not strike the sorcerer blind. It plainly reads that Paul proclaimed to Elymas, "Now the hand of the Lord is against you. You are going to be blind for a time, not even able to see the light of the sun.” Paul basically prophesied what God was going to do.
Paul knew from experience you don't "kick against the pricks" with God. You don't proclaim your own will and call it God's working. Paul did that once. He dragged people to their death believing he was doing God a favor. And Paul was struck blind for a time and was humbled by the Lord.
Now Elymas was attempting the same stunt. But Paul spoke by the anointing of the Holy Spirit, "You are a child of the devil and an enemy of everything that is right! You are full of all kinds of deceit and trickery. Will you never stop perverting the right ways of the Lord?" The sorcerer needed to have an end to his shenanigans because he was interfering in someone's salvation (the proconsul).
When the Lord made a example of the sorcerer, the proconsul was amazed and believe Jesus Christ.
So we have these 2 facts:
1. Paul would not dare to do something of his own accord, he did what the Holy Spirit directed him to do. He learned his lesson on the road to Damascus.
2. Elymas was doing exactly what Paul did as Saul, interfering with God's work in bringing people to salvation thru Christ. Elymas got stopped exactly how Paul got stopped: BY GOD'S HAND.
There is no way Paul went around ranting and raving about particular sinners. Paul knew better than to cowboy the gospel. Paul was a humble man, a fatherly man, and he would deny any testimony that gave him credit for anything he did in Christ.
Galatians 6:14
But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world.
Galatians 2:20
I have been crucified with Christ and I no longer live, but Christ lives in me. The life I now live in the body, I live by faith in the Son of God, who loved me and gave himself for me.
I Corinthians 2:2
For I determined not to know any thing among you, save Jesus Christ…