I really don't know how he found out. I know from my research that slaves had a some sort of way of getting information to each other, kinda of like a hotline and word was just passed around.

As for the 'no big deal" thing, that's exactly what's so insidious about those PragerU videos. No thinking adult would ever believe that (unless they're already of that ilk). They have to get 'em while they're young so they can brainwash an entire generation of future voters to ensure sufficient numbers to keep our demands for equality from being met. They're actually hiding behind children...think about that for a second.