It looks like BF joined an unbalanced fight and made it even. Numerous other people joined from other nations and so on. BF decided to peace out. Maybe they were concerned about Havoc trying to kill them after the battle, maybe they didn't want to spend their time ganking.
Admin's ruling about starting a fight and fighting doesn't apply here. BF started the fight with every intention of fighting and when the situation changed they decided to leave. Nothing wrong with leaving a battle. This is not an exploit. When you join a fight that has other nations in it, don't expect them to help you.
Don't know why Aloha is in trouble here, looks like they did the lion's share of fighting.