Wording was good enough, but not everyone would see few friend requests and not being black listed as benefit.

The player joined your group without knowing the fight, okay that's bad. But they said it right away, which leads to assumption that if they were allowed to clear it with you, they would have stayed for the farm afterwards. They basically got a hug when they wanted to get a cookie. You think they benefited from your interaction, I can't completely agree with that. As long as they weren't provided help with the fight the benefit is just hypothetical. They might benefit from it evnetually, they might not. Based on their behaviour I wouldn't expect them to ask for the help themselves, which means that it does not allow them to progress in any way.