You need to understand this rule! | Leaders board game | Short guide

About Leaders, from BoardGameGeek:

What is the secret of this kingdom, where peace has reigned for thousands of years? Every spring, aspiring rulers recruit four allies and face off in unusual duels. No armies, no blood: the first to capture their rival wins. Your time has come. Tactical thinking, daring, and strategy will distinguish the true Leaders! Create a team of unique Champions in order to defeat the opposing Leader! To win, either position two of your champions next to your opponent's Leader to capture them, or skillfully maneuver so the opponent's Leader is surrounded, leaving no adjacent empty spaces. -description from the publisher