Basically, get an Infernal Stone and go to AV.
Try to be the first one to leave gates.
Once you leave, summon an Infernal on the gates. If you do it quickly enough, people won't be able to mount (infernal meteor will put them in combat) and you'll lose precious time. If you keep it banished people will have to walk away to leave combat.
I saw a Warlock doing it early today and tried on my own. Many lulz insued.