Suppose you are at a party and see an intoxicated friend being led to the bedroom by a person that your friend met that night at the party. What can you do?
Direct - Stop them. Ask the person who is being led to the bedroom if he/she is ok, ask do you need help? Walk him/her out of the situation.
Distract - Ask friends of each person to go with you to distract them from going to the bedroom. Say something like, "We agreed to go to get something to eat. Let's go." Or say something as simple as, "Hey, we need to go. Let's go."
Delegate - Let others handle the situation by telling the person hosting the party or a person in authority.