Minor's Options in Florida

I have a friend who will be 18 in August. His father is very abusive, but also influential with the authorities in this area. He filed for a temporary injunction for protection against domestic violence after the Department of Children and Families refused to help him. While under the injunction, he moved in with me (I'm 23), got a job, and started supporting himself. When the final injunction hearing came up, the injunction was dismissed because I had signed on his behalf and I'm not a blood relative. However, his parents let him continue to live with me for awhile. Then suddenly, they called the sheriff and reported him as a runaway. He was picked up and after two days in a shelter, released to his parents. He was physically assaulted again then, and locked in his room for the entire day with no food or drink. My husband called the Abuse Registry to file a report, and two deputies were sent to his house. They confronted his father and said that if anything else ever happened, the father would be arrested and my friend removed from the house. However, he's still there for now, and the local sheriffs have been less than helpful so far. Given the fact that he's been on his own for three months and is almost 18, what are his options? He would like to be emancipated, but I understand that can take months and be very expensive. I would be willing to take guardianship if necessary. What would be the best course of action? He would like to go on his own or with me as opposed to a shelter, but is willing to do whatever is necessary to get out of the house. Please advise.