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I watched that little video at least 5 or 6 times and I didn't see anything "suspicious" but then again I didn't have the first damned clue what I was looking for either, because of course the article doesn't TELL YOU THAT.
It's a stupid article and they should have just skipped it.
HOW would something "sinister" come on that fast anyway? This is likely something these people were exposed to before they entered the rally seating area or else it was a planned, coordinated attack by the LEFTISTS and they did something to the seats or the handrails or something. Who the hell knows. Maybe next time the people who write this kind of shit could give us 1/2 a clue???