Do prepare to sue him Terry. As Finkelstein mentioned I'm sure some lawyers would likely take up your case without any upfront costs, just a percentage of the award. Even a mediocre lawyer can help you out. Don't worry about the merits of your case, that's up to an attorney to decide.
Sounds like an open and shut case which should not see any extended court actions just a quick settlement.
PS: Take pictures of your wounds and get a copy of any hospital records.