Well, here’s my citation for that claim:
The Florida Court of Appeals in Owens v. State, 289 So. 2d 472 (1974), quoted with approval Anderson v. State, 291 N.E.2d 579 (1973), wherein “great bodily harm” was found in a case in which the victim was struck five blows with a fist.
FSA § 776.012 says that a person may use deadly force if he reasonably believes that such force is necessary to prevent great bodily harm.