I read that Baba referred to Vitthal as a 'runaway.' What was the context of this statement and what happened afterwards?

This intriguing statement was made to Kakasaheb Dixit, as described in Chapter 4. After Kakasaheb had a vision of Vitthal during his morning meditation, he went for Sai Baba's darshan. Baba, with his characteristic omniscience, surprisingly asked him, "Vitthal Patil had come, right? Did you meet him?" He then added, "That Vitthal is a big runaway! Nail him down and make him steady. He will escape if you avert your eyes, even for a moment of neglect." The story continues that afternoon when a traveling seller arrived with twenty-five pictures of Vitthal of Pandharpur. The image in the pictures was an exact replica of the form Kakasaheb had seen in his vision, leaving him amazed and validating Baba's cryptic words.