Notice that the man still had the evil spirit after he was baptized. Christians can have demons and evil spirits. This is why we need to pray for people after baptizing them! After he was baptized in water and Torben cast out the evil spirit in him, Torben then baptized him in the Holy Spirit.
Acts 8:14-17Amplified Bible (AMP)
14 When the apostles in Jerusalem heard that [the people of] Samaria had accepted the word of God, they sent Peter and John to them. 15 They came down and prayed for them that they might receive the Holy Spirit; 16 for He had not yet fallen on any of them; they had simply been baptized in the name of the Lord Jesus [as His possession]. 17 Then Peter and John laid their hands on them [one by one], and they received the Holy Spirit.
Acts 10:44-48Amplified Bible (AMP)
44 While Peter was still speaking these words, the Holy Spirit fell on all those who were listening to the message [confirming God’s acceptance of Gentiles]. 45 All the circumcised believers who came with Peter were amazed, because the gift of the Holy Spirit had been poured out even on the Gentiles. 46 For they heard them talking in [unknown] tongues (languages) and exalting and magnifying and praising God. Then Peter said, 47 “Can anyone refuse water for these people to be baptized, since they have received the Holy Spirit just as we did?” 48 And he ordered that they be baptized in the name of Jesus Christ. Then they asked him to stay there for a few days.
Mark 16:16-18Amplified Bible (AMP)
16 He who has believed [in Me] and has been baptized will be saved [from the penalty of God’s wrath and judgment]; but he who has not believed will be condemned. 17 These signs will accompany those who have believed: in My name they will cast out demons, they will speak in new tongues; 18 they will pick up serpents, and if they drink anything deadly, it will not hurt them; they will lay hands on the sick, and they will get well.”
DO YOU BELIEVE THAT MARK 16:16-18 WAS ONLY FOR THE PEOPLE 2,000+ YEARS AGO? OR DO YOU BELIEVE IT IS ALSO FOR TODAY? GOD NEVER CHANGES. HIS WORD NEVER CHANGES. These signs follow those who BELIEVE. Who what? BELIEVE. Believe in who? JESUS and the simple message of the Gospel.