He did slow down and was in control, no real danger. But it's not very courteous to them either, especially the 2nd time. Imagine a nervous mom seeing an RC make a typical 40+ mph pass (much faster in this case) then come near their kids. Doesn't matter if you slow down when those moms sue playgrounds because their kid got hurt on the monkey bars. All it takes in one complaint about someone not being courteous and/or dangerous and "No RC" signs start going up. When there's room to stay away and not disturb others at all I think we all should be courteous and give others space.

Thanks for sharing the vid though. Damn that thing really gets moving when you open it up! Making me think my 8T needs more power and a bigger space than my short dead end block.