Heroic Witness

When the heroes' friends or family member saw the main antagonist kidnapped or talking with someone else, they realize that their love ones or heroines need helps. So they can stop them or try to find the main protagonist before it's too late.

Sometimes, they don't know until they saw that the main antagonist is revealing their plans to the heroines after kidnapping them. So they listen and decide to be the hero or get the main protagonist to save their love ones.