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Let me clarify. It most likely refers to a one-on-one battle. This is evident in the video. In other words, if you attack an enemy unit, you should do so with only one of your units; otherwise, you won't receive the bonus. At least, that's how I understand it.
Фанатское руководствo по Героям VI (spamm, alexrom66, Павлов и Magic Art): Английская (v.0.93) и Русская (v.0.93.1) версии
Арт-бук вы можете взять здесь
へ へ
の の
も
へ
Арт-бук вы можете взять здесь
へ へ
の の
も
へ