What does 2 Kings 9:17 mean?

A lookout on the tower in Jezreel saw Jehu and his men coming. He called out, I see a group of people coming! Joram said, Send a rider to ask if they come in peace. 2 Kings 9:17 - Modern Text Bible

(The city’s lookout spots Jehu’s approach. Joram, not suspecting trouble, sends someone to check if Jehu’s intentions are peaceful.)