How many different links do you want to the symptoms of a head injury? I will provide them if you like, here is one
http://www.drugs.com/cg/minor-head-injury.html
LE and the EMT KNEW that Zimmerman was claiming a head injury, and with a head injury even a "Minor head injury" which is the site I gave you, these and other things are the common symptoms
So what you are saying is that Zimmerman actually did have his head slammed into the pavement, and there was a laceration on his scalp to prove it, and the EMT who would know very well, that one of the symptoms of a head injury is confusion , trouble thinking and remembering, which also includes trouble making rational decisions, simply took his word for it that he did not want to go to the hospital and put his life in danger
Maybe that's how they do it in Florida, but here if there is any doubt, such as the common symptoms of your injury causing you to make a decision that is not in your best interest, then you would be taken to hospital.