Lindsey's near ... (spoilers)?
I'm not a doctor, I never went to med school or anything like that or really care to, so maybe someone with more experience would know..
Lindsey was probably oxygen deprived for at least 10 minutes (estimate obviously) after drowning, wouldn't she have a very high chance of being brain dead if she in fact survived that? Thought it was a OK movie and all (not great) but this thought bothered me a little when watching the scene.