So you are running around on patrol, and a high level Public Event spawns. For what ever reason you want to get it done but you are getting your ass whooped. What if you could pull your Ghost out, push a button, and now everyone on your friends list receives an audio cue that one of their friends wants help. They open up the in game friends list, and see a blinking exclamation point over your name. Potentially, friends can keep joining till the fire team is full. Sounds like an awesome feature to me and is not just limited to patrol. Raids, Crucible, and Story Missions could all be made more social with this mechanic. Let me know what you think!