Hell the article doesn't even go into any medical detail on really what a seizure is. I am no expert except that I have had a few of them, and basically it is like a lightning storm passing through your brain and setting of nerve impulses through out your body. Hence the uncontrollable shaking one sees in a typical seizure and the incoherence shown by the person suffering one.

Basically Hatton suffered a massive concussion not a seizure.