Following the disaster on the Broken Shore, Heartwing is now in more in a desperate time than ever. The Cataclysm is the only event in Heartwing's history that comes close to the disaster that Heartwing is currently facing.
On the Broken Shore, Heartwing was pushing back the tide of the Burning Legion. It all would've ended there. The Alliance and Horde retreated, leaving Heartwing to deal with the Burning Legion above the Tomb of Sargeras by themselves. With several members already dead, the true disaster had not shown itself yet.
From the Felstorm, Helius. The progenitor of the felbrood and the leader of all dismay that has ever happened to Heartwing showed himself, through his presence. The demons grew enraged and had a hunger for blood. Dragons fell after one another.
The Leader of Heartwing, Aerenstrasz was taken by Helius. Azraelstrasz, the oldest of the Tyranistres felt to the ocean and had most of the bones in his body broken. Aryiastrasza fell into a deep slumber in an effort to save her consort.
In an effort to know that Heartwing would've died that day if not for the call of Aerdranstrasz to the other remains of the Heartwing organization, what was left anyway to retreat. Heartwing could not win that day.
Evaded Helius' wrath in the last second, Heartwing retreated into a cavern nearby in Suramar. Assessing the wounds of their few members before knowing that Helius is on the hunt for them. Heartwing would not be safe anytime soon.
A message to all new applicants
Heartwing is not in an situation to be able to call for aid. But what you would know as a dragon is that Helius and Burning Legion is not out just out for Heartwing. Their primary objective as assigned by the Lord of the Burning Legion to annihilate all resistance from the Dragonflights. Which means that eventually the Burning Legion would hunt you too.
Which will put you in a similar to that, which Heartwing is facing. On the hunt from people who would see their extinction.
For this, Coordinators inside the guild will help create a scenario of how your character ends up in Heartwing. Heartwing is in an hideout that doesn't just allow for people to know about their location before hand, which means your entry has to be coordinated.
A message to all members that was not part of the Broken Shore event that happened
You would've survived, but not unscatched. You can make up your own story of what your character did at the Broken Shore (keep it simple, if there is anything iffy, big demons and big plot lines used, please bring it up with a Coordinator or Officer), but remember the Broken Shore is supposed to be a traumatizing experience. Your character would be heavily wounded, and on the brink of death. If you were not part of the Prime Event itself, please coordinate with members that they find you, instead of just appearing in the hideout.