It is rude to ditch friends
Amy is at the bar with her friend who has become quite drunk and is behaving badly.
Amy wants to leave the bar.
Amy coaxes her friend into calling it a night and guides her out of the bar.
Amy pays her tab and leaves the bar without telling her friend because she doesn't think her friend would leave with her.
Amy gets her friend home safely and her friend is able to sleep off the night.
Amy's friend gets more drunk and is taken advantage of without Amy around to look out for her.