What does 2 Kings 9:19 mean?

Joram sent out a second rider, who asked the same question. Jehu gave the same answer: What does it matter to you? Get behind me. Again, the lookout said, He’s not coming back either. 2 Kings 9:19 - Modern Text Bible

(A second messenger is sent and gets the same treatment. The lookout realizes something is off as both messengers disappear.)