The initial flick is 1/24 and hence very fast. Speed and focus is required to hit that pattern straight up

For the remaining flicks, since the frequency of flick notes is (mostly) twice the frequency of tap notes, it means that every time you tap, your flick finger is going the same direction. Do take note of those "solo" flicks that dont have any zig zags in-between as it might be easy to just slide blindly with the right hand and fumble flicks due to not paying attention.