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Well moving the leader is your own idea.
You have to figure out how to do it.
Forget programming and write down steps to take if you were to walk across a field and do it yourself.

1 Decide when...

First you have to decide how to solve the problem.
You said you want to remove and replace the leader of the flock to prevent being locked in a corner.
Where are your list of steps to follow?...

Where are you stuck?
What is the nature of your problem?
What were you working on that led you to the forum for help?

So what is your question?