When he finds him he gives him a little nudge.
Sometimes Kevin ignores him, sometimes Kevin erm, sends him flying. I don't approve of this but bucks will be bucks even if they are technically not bucks any longer.
Harry is learning to butt back which is a good thing. Soon he and Kevin will be closer in size and then Kevin will have an equal to butt.
They do love each other though and they usually end up the day by just grazing peacefully together. It is good for both of them.
Sometimes we older goats forget about playing and how important it is to a little kid. I think you humans have the same problem so let this be a reminder for all of us old goats to find some time for play in our days!