Demetrius incited people to shout and to riot.

Acts 19:25-31

25 Demetrius called a meeting of his workmen and also of others who made the little silver images. He said to them, “Men, you know that we (inc) earn a lot of money doing our kind of work. 26 Also, you know that this fellow Paul has persuaded many people who live in Ephesus to no longer buy the images that we make. Now even the people from many other towns in our province no longer want to buy what we make. This fellow tells people that the gods that we have made and worship are not gods and that we should not worship them. 27 If people continue to listen to him, soon they will ruin our business. Besides, they will no longer think that they should come to the temple of Artemis to worship her. People all over our Asia province and everywhere [HYP] else worship our great goddess Artemis. Soon people may no longer consider that Artemis is great!” 28 All the men there were very angry at Paul when they heard what Demetrius said. They began to shout, “The goddess Artemis of us Ephesians is very great!” 29 Many of the other people in the city heard the shouting and went and joined the crowd. They also became angry at Paul and began shouting. Several of the people seized Gaius and Aristarchus, two men from Macedonia who had been traveling with Paul. Then the whole crowd of people ran, dragging those men along with them, to the city stadium. 30 Paul also wanted to go to the stadium and speak to the people, but the other believers would not let him go there. 31 Also, some government officials of that province who were friends of Paul heard what was happening. So they sent someone to tell him urgently not to go into the stadium.