I'm an ICU nurse...I've seen more than a few seizures. People having seizures generally don't just lose their balance, they don't move their legs forward (regardless of the ability to hold any weight on her legs). When someone has a seizure, they (usually) drop like a stone and are (always) completely unaware of all surroundings.
THAT WAS NOT A SEIZURE
It looked much like most people look when their blood pressure drops dangerously low, which is a common result of dehydration/heat exhaustion.
Look..there's smoke here, and I'm not going to deny it. Clinton has been far less than forthcoming about her health in general, and she's had several episodes that we know of where she has become light-headed and fell. She could simply be a sickly type that's prone to low BP when she gets sick (I've seen more than a few of these), or there could be a more serious, undisclosed, issue. The first really isn't that big a deal, even if seeing it is scary. The second obviously would depend on what it is.
What I AM sure of is that what we see on that brief video is absolutely consistant with someone pushing themselves far too hard while battling a pneumonia, suffering heat exhaustion and a subsequent drop in blood pressure. IE: The story they tell actually DOES make sense. Whatever it really was....it wasn't a seizure.
Further, most voting for Hillary wouldn't really care if she became so ill she had to resign...we're OK with the alternatives to succeed her, in many cases preferring those alternatives...but nothing about her health would ever make us change to voting Trump. IE: Even if it's an issue, it's still a non-issue.