What does 2 Kings 9:15 mean?

Jehu told his men, If you’re really on my side, don’t let anyone leave the city to warn Jezreel. Then Jehu got in his chariot and headed straight for Jezreel, where Joram was resting from his injuries. King Ahaziah of Judah was visiting him there. 2 Kings 9:15 - Modern Text Bible

(Jehu wants to keep his plan secret, so he orders his men to stop anyone from warning the king. He rushes to Jezreel, where both kings are together.)