Wait. Hold on.
Let me try to explain you this.
In the beginning, where you have auto friends = hero.findFriends(); it means that you call the hero.findFriends() array with one word: friends.
After for, you have auto friend = friends[i], or it could be hero.findFriends()[i], which gives you one friend, not an array. And after this, you command one friend to attack the enemy.
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