When Moses notices the burning bush he could have said, “oh wow look at that,” and just kept going with his sheep. Or “that’s interesting but I don’t have time to check that out, I have an agenda to keep, I’ll come back later.” Or he could have been busy looking down at his phone and glanced up and thought, meh, and gone back to the captivating cat video he was watching.
The point is if he had decided to just keep on going with his sheep or if he had decided to come back later, he wouldn’t have been Moses. He would have just been another guy, just another shepherd. Instead, he is paying attention and turns aside to see the great sight of God and because he does, he becomes this great partner with God who gets to work with God to set people free.