OK here is this from the same section of law..

However, a person is justified in the use of deadly force and does not have a duty to retreat if:
(1) He or she reasonably believes that such force is necessary to prevent imminent death or great bodily harm to himself or herself or another or to prevent the imminent commission of a forcible felony; or

So the phrase “reasonably believe” is key. The defendant has to reasonably believe they were facing imminent death or great bodily harm, which means they have to be reasonable to begin with. The police were within their right to order a blood test to check for alcohol or narcotics seeing as there was no obvious reason for Zimmerman to believe his life was endangered. The kid was unarmed, and Zimmerman had no serious injuries if he had any injuries at all. The Sanford police went out of their way to roll over and play dead for Zimmerman.